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» Introduction","id":"0","title":"Introduction"},"1":{"body":"The Internet currently lacks effective, privacy-preserving Data Provenance . TLS , also known as the \"s\" in \"https\" 🔐 to the general public, ensures that data can be securely communicated between a server and a user. But how can this user credibly share this data with another user or server without compromising security, privacy, and control? Enter TLSNotary: a protocol enabling users to export data securely from any website. Using Zero Knowledge Proof (ZKP) technology, this data can be selectively shared with others in a cryptographically verifiable manner. TLSNotary makes data truly portable and allows users to share it with others as they see fit.","breadcrumbs":"Introduction » Data Provenance without Compromising Privacy, That is Why!","id":"1","title":"Data Provenance without Compromising Privacy, That is Why!"},"10":{"body":"The decentralized internet demands privacy-respecting data provenance! Data provenance ensures internet data is authentic. It allows verification of the data's origin, ensuring it hasn't been fabricated or tampered with. Data provenance will make data truly portable, empowering users to share it with others as they see fit.","breadcrumbs":"Motivation » Motivation","id":"10","title":"Motivation"},"11":{"body":"Transport Layer Security (TLS) plays a crucial role in digital security. TLS protects communication against eavesdropping and tampering. It ensures that the data received by the User indeed originated from the Server and was not changed. The Server's identity is verified by the User through trusted Certificate Authorities (CAs). Data integrity is maintained by transmitting a cryptographic hash (called Message Authentication Code or MAC in TLS) alongside the data, which safeguards against deliberate alterations. However, this hash does not provide non-repudiation , meaning it cannot serve as evidence for the authenticity and integrity of the data to third parties (e.g., a service or an app). Because it is a keyed hash and TLS requires that the key is known to the User, the User could potentially modify the data and compute a corresponding hash after the TLS session is finished. Achieving non-repudiation requires digital signatures implemented with asymmetric, public-key cryptography. While the concept seems straightforward, enabling servers to sign data is not a part of the TLS protocol. Even if all data were securely signed, naively sharing all data with others could expose too much information, compromising the User's privacy. Privacy is a vital social good that must be protected.","breadcrumbs":"Motivation » Non-repudiation: TLS is not enough","id":"11","title":"Non-repudiation: TLS is not enough"},"12":{"body":"Currently, when a User wants to share data from a Server with another party, OAuth can be used to facilitate this if the application supports it. In this way, the other party receives the data directly from the Server, ensuring authentic and unchanged data. However, applications often do not provide fine-grained control over which data to share, leading to the other party gaining access to more information than strictly necessary. Another drawback of this solution is that the Server is aware of the access delegation, enabling it to monitor and censor the other user’s requests. It's worth noting that in many instances, OAuth is not even presented as an option. This is because a lot of servers lack the incentive to provide third-party access to the data.","breadcrumbs":"Motivation » Status Quo: delegate access","id":"12","title":"Status Quo: delegate access"},"13":{"body":"TLSNotary operates by introducing a third party, the Notary, into the usual TLS connection between the User and a Server. This Notary is not an intermediary . Instead, the Notary participates in a secure multi-party computation (MPC) to jointly manage the TLS connection without ever viewing the data in plain text; the Notary only has access to encrypted data. Furthermore, as the Notary only possesses the ephemeral keys of the Server, it remains unaware of which Server the User is communicating with. The TLSNotary protocol is transparent to the Server. From the Server's perspective, the TLS connection is indistinguishable from all other connections. As such, no modifications to the TLS protocol are necessary . The TLSNotary protocol enables the User to selectively prove the authenticity of arbitrary portions of the data to a Verifier as long as the Verifier trusts the Notary who signed the data.","breadcrumbs":"Motivation » TLSNotary: data provenance and privacy with secure multi-party computation","id":"13","title":"TLSNotary: data provenance and privacy with secure multi-party computation"},"14":{"body":"TLSNotary is a solution designed to prove the authenticity of data while preserving user privacy. It unlocks a variety of new use cases. So, if you're looking for a way to make your data portable without compromising on privacy, TLSNotary is developed for you! Dive into the protocol and integrate it into your applications. We eagerly await your feedback on Discord .","breadcrumbs":"Motivation » Make your data portable with TLSNotary!","id":"14","title":"Make your data portable with TLSNotary!"},"15":{"body":"This guide will take you through the steps of: starting a Notary server running a Prover to notarize some web data running a Verifier to verify the notarized data Note that the TLSNotary protocol assumes that the Notary is trusted by the Verifier. To minimize the trust, the Verifier itself can act as a Notary.","breadcrumbs":"Quick Start » Preliminaries","id":"15","title":"Preliminaries"},"16":{"body":"If you don't have rust installed yet, install it with rustup : curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh","breadcrumbs":"Quick Start » Install rust","id":"16","title":"Install rust"},"17":{"body":"","breadcrumbs":"Quick Start » Guide","id":"17","title":"Guide"},"18":{"body":"git clone https://github.com/tlsnotary/notary-server\ncd notary-server\ncargo run --release The Notary server will now be running in the background waiting for connections from a Prover. You can switch to another console to run the Prover. For more information on how to configure the Notary server, please refer to this .","breadcrumbs":"Quick Start » Start a Notary server:","id":"18","title":"Start a Notary server:"},"19":{"body":"git clone https://github.com/tlsnotary/tlsn\ncd tlsn/tlsn/examples\ncargo run --release --example simple_prover The notarization session usually takes a few moments and the resulting proof will be written to the \"proof.json\" file. The proof can then be passed on to the Verifier for verification. The simple_prover notarizes https://example.com and redacts the USER_AGENT HTTP header from the proof for the Verifier. You can change the code in tlsn/tlsn/examples/simple_prover.rs to meet your needs: change which server the Prover connects to add or remove HTTP request headers redact other strings in the request or the response ⚠️ Please note that by default the Notary server expects that the cumulative size of the request and the server response is not more than 16KB.","breadcrumbs":"Quick Start » Run a simple Prover:","id":"19","title":"Run a simple Prover:"},"2":{"body":"The TLSNotary protocol consists of 4 steps: The User requests the data from the Server privately and securely. The Notary checks for data tampering and signs the data. The User selectively discloses the data to the Verifier. The Verifier verifies the data.","breadcrumbs":"Introduction » How Does the TLSNotary Protocol Work?","id":"2","title":"How Does the TLSNotary Protocol Work?"},"20":{"body":"cargo run --release --example simple_verifier This will verify the proof from the simple_prover (proof.json) and output the result to the console. Note how the parts which the prover chose not to disclose will be shown as \"X\": GET / HTTP/1.1\nhost: example.com\naccept: */*\naccept-encoding: identity\nconnection: close\nuser-agent: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX","breadcrumbs":"Quick Start » Run a simple Verifier:","id":"20","title":"Run a simple Verifier:"},"21":{"body":"During the MPC-TLS Phase the Prover and the Notary work together to generate an authenticated Transcript of a TLS session with a Server. Listed below are some key points regarding this process: The identity of the Server is not revealed to the Notary, but the Prover is capable of proving the Server identity to a Verifier later. The Notary only ever sees the encrypted application data of the TLS session. The protocol guarantees that the Prover is not solely capable of constructing requests, nor can they forge responses from the Server.","breadcrumbs":"MPC-TLS » MPC-TLS","id":"21","title":"MPC-TLS"},"22":{"body":"A TLS handshake is the first step in establishing a TLS connection between a User and a Server. In TLSNotary the User is the one who starts the TLS handshake and physically communicates with the Server, but all cryptographic TLS operations are performed together with the Notary using MPC. The User and Notary use a series of MPC protocols to compute the TLS session key in such a way that both only have their share of the key and never learn the full key. Both parties then proceed to complete the TLS handshake using their shares of the key. With the shares of the session key computed and the TLS handshake completed, the parties now proceed to the next MPC protocol where they use their session key shares to jointly generate encrypted requests and decrypt server responses while keeping the plaintext of both the requests and responses private from the Notary. Note: to a third party observer, the User's connection to the server appears like a regular TLS connection and the security guaranteed by TLS remains intact for the User. The only exception is that since the Notary is a party to the MPC TLS, the security for the User against a malicious Notary is guaranteed by the underlying MPC protocols and not by the TLS.","breadcrumbs":"MPC-TLS » TLS Handshake » TLS Handshake","id":"22","title":"TLS Handshake"},"23":{"body":"This section explains how the User and Notary use MPC to encrypt data for the server, decrypt data received from the server, and compute the MAC for the ciphertext using MPC.","breadcrumbs":"MPC-TLS » Encryption and Decryption » Encryption, Decryption, and MAC Computation","id":"23","title":"Encryption, Decryption, and MAC Computation"},"24":{"body":"To encrypt the plaintext, both parties input their TLS key shares as private inputs to the MPC protocol, along with some other public data. Additionally, the User inputs her plaintext as a private input. Both parties see the resulting ciphertext and execute the 2PC MAC protocol to compute the MAC for the ciphertext. The User then dispatches the ciphertext and the MAC to the server. As explained in the Commitment section , the User creates a commitment to the plaintext (her private input to MPC).","breadcrumbs":"MPC-TLS » Encryption and Decryption » Encryption","id":"24","title":"Encryption"},"25":{"body":"Once the User receives the ciphertext and its associated MAC from the server, the parties first authenticate the ciphertext by validating the MAC. They do this by running the MPC protocol to compute the authentic MAC for the ciphertext. They then verify if the authentic MAC matches the MAC received from the server. Next, the parties decrypt the ciphertext by providing their key shares as private inputs to the MPC protocol, along with the ciphertext and some other public data. The resulting plaintext is revealed ONLY to the User. As discussed in the Commitment section , the User creates a commitment to the plaintext. Please note, the actual low-level implementation details of Decryption are more nuanced than what we have described here. For more information, please consult Low-level Decryption details .","breadcrumbs":"MPC-TLS » Encryption and Decryption » Decryption","id":"25","title":"Decryption"},"26":{"body":"This chapter illustrated how the Notary and User collaborate to encrypt and decrypt data. The Notary performs these tasks \"blindly\", without acquiring knowledge of the plaintext. In fact, the Notary even remains unaware of which Server the User is communicating with. Additionally, the User creates commitments to the plaintext and can use them later to prove the authenticity of the plaintext to a third party Verifier.","breadcrumbs":"MPC-TLS » Encryption and Decryption » Summary","id":"26","title":"Summary"},"27":{"body":"As part of the TLSNotary protocol, the User creates authenticated commitments to the plaintext and the Notary signs those commitments without ever seeing the plaintext. This offers a way for the User to selectively prove the authenticity of arbitrary portions of the plaintext to the Verifier. A naive approach of creating such authenticated commitments is to extend the Encryption and Decryption steps to also compute a commitment (e.g. a blake3 hash) to the plaintext using MPC and have the Notary sign that commitment. Unfortunately, such MPC approach is too resource-intensive, prompting us to provide a more lightweight commitment scheme. The high-level idea is that the User creates a commitment to the encodings from the MPC protocol used for Encryption and Decryption. Since those encodings are chosen by the Notary and are not known to the User at the time when she makes a commitment, they can be thought of as \"authenticated plaintext\".","breadcrumbs":"MPC-TLS » Commitment » Commitment","id":"27","title":"Commitment"},"28":{"body":"At the end of the TLSNotary protocol, the Notary signs an artifact known as a Session Header, thereby attesting to the authenticity of the plaintext from a TLS session. A Session Header contains a User's commitment to the plaintext and a User's commitment to TLS-specific data which uniquely identifies the server. The User can later use the signed Session Header to prove data provenance to a third-party Verifier. It's important to highlight that throughout the entire TLSNotary protocol, including this signing stage, the Notary does not gain knowledge of either the plaintext or the identity of the server with which the User communicated.","breadcrumbs":"MPC-TLS » Signing » Signing the Session Header","id":"28","title":"Signing the Session Header"},"29":{"body":"A Verifier receives the following from the User: domain name (e.g. \"tlsnotary.org\") signed Session Header openings to the commitments (the plaintext which the User committed to) handshake_data which consists of: server certificate key exchange details client and server random and performs the following steps to verify the commitments: verify that Session Header was signed by the Notary verify handshake_data against handshake_commitment verify validity of server certificate for the domian name verify that key exchange details were signed by server certificate use encoder_seed to re-generate encodings and re-create a commitment for the opening plaintext (maybe this step needs to be spelled out in more detail) use merkle_root to check that this re-created commitment is in the Merkle tree To summarize: the Verifier will only learn those portions of the TLS session transcript which the User chose to reveal. The portions which were not revealed (User's private data) will appear to the Verifier as redacted. Here is an example of what the Verifier output may look like:","breadcrumbs":"Verification » Verification","id":"29","title":"Verification"},"3":{"body":"TLSNotary works by adding a third party, the Notary, to the usual TLS connection between the User and a Server. This Notary is not \" a man in the middle \" . Instead, the Notary participates in a secure multi-party computation (MPC) to jointly operate the TLS connection without ever seeing the data in plain text; the Notary only sees encrypted data. Given that the Notary only sees the temporary key of the Server, the Notary does not know which Server the User is communicating with. The TLSNotary protocol is transparent to the Server. From the Server's perspective, the User's connection is a standard TLS connection.","breadcrumbs":"Introduction » ① Multi-party TLS Request","id":"3","title":"① Multi-party TLS Request"},"30":{"body":"In TLS, the first step towards obtaining TLS session keys is to compute a shared secret between the client and the server by running the ECDH protocol . The resulting shared secret in TLS terms is called the pre-master secret PMS. Using the notation from Wikipedia, below is the 3-party ECDH protocol between the Server the Requester and the Notary, enabling the Requester and the Notary to arrive at shares of PMS. Server sends its public key Qb​ to Requester, and Requester forwards it to Notary Requester picks a random private key share dc​ and computes a public key share Qc​=dc​∗G Notary picks a random private key share dn​ and computes a public key share Qn​=dn​∗G Notary sends Qn​ to Requester who computes Qa​=Qc​+Qn​ and sends Qa​ to Server Requester computes an EC point (xp​,yp​)=dc​∗Qb​ Notary computes an EC point (xq​,yq​)=dn​∗Qb​ Addition of points (xp​,yp​) and (xq​,yq​) results in the coordinate xr​, which is PMS. (The coordinate yr​ is not used in TLS) Using the notation from here , our goal is to compute xr​=(xq​−xp​yq​−yp​​)2−xp​−xq​ in such a way that Neither party learns the other party's x value Neither party learns xr​, only their respective shares of xr​. We will use two maliciously secure protocols described on p.25 in the paper Efficient Secure Two-Party Exponentiation : A2M protocol, which converts additive shares into multiplicative shares, i.e. given shares a and b such that a + b = c, it converts them into shares d and e such that d * e = c M2A protocol, which converts multiplicative shares into additive shares We apply A2M to yq​+(−yp​) to get Aq​∗Ap​ and also we apply A2M to xq​+(−xp​) to get Bq​∗Bp​. Then the above can be rewritten as: xr​=(Bq​Aq​​)2∗(Bp​Ap​​)2−xp​−xq​ Then the first party locally computes the first factor and gets Cq​, the second party locally computes the second factor and gets Cp​. Then we can again rewrite as: xr​=Cq​∗Cp​−xp​−xq​ Now we apply M2A to Cq​∗Cp​ to get Dq​+Dp​, which leads us to two final terms each of which is the share of xr​ of the respective party: xr​=(Dq​−xq​)+(Dp​−xp​)","breadcrumbs":"Key Exchange » Key Exchange","id":"30","title":"Key Exchange"},"31":{"body":"Some protocols used in TLSNotary need to convert two-party sharings of products or sums of some field elements into each other. For this purpose we use share conversion protocols which use oblivious transfer (OT) as a sub-protocol. Here we want to have a closer look at the security guarantees these protocols offer.","breadcrumbs":"Finite-Field Arithmetic » Finite-Field Arithmetic","id":"31","title":"Finite-Field Arithmetic"},"32":{"body":"Our goal is to add covert security to our share conversion protocols. This means that we want an honest party to be able to detect a malicious adversary, who is then able to abort the protocol. Our main concern is that the adversary might be able to leak private inputs of the honest party without being noticed. For this reason we require that the adversary cannot do anything which would give him a better chance than guessing the private input at random, which is guessing k bits with a probability of 2−k for not being detected. In the following we want to have a closer look at how the sender and receiver can deviate from the protocol. Malicious receiver Note that in our protocol a malicious receiver cannot forge the protocol output, since he does not send anything to the sender during protocol execution. Even when this protocol is embedded into an outer protocol, where at some point the receiver has to open his output or a computation involving it, then all he can do is to open an output y′ with y′=y, which is just equivalent to changing his input from b→b′. Malicious sender In the case of a malicious sender the following things can happen: The sender can impose an arbitrary field element b′ as input onto the receiver without him noticing. To do this he simply sends (tik​,tik​) in every OT, where k is i-th bit of b′. The sender can execute a selective-failure attack, which allows him to learn any predicate about the receiver's input. For each OT round i, the sender alters one of the OT values to be Tik​=tik​+ci​, where ci​∈F,k∈{0,1}. This will cause that in the end the equation a⋅b=x+y no longer holds but only if the forged OT value has actually been picked by the receiver. The sender does not use a random number generator with a seed r to sample the masks si​, instead he simply chooses them at will.","breadcrumbs":"Finite-Field Arithmetic » Adding covert security","id":"32","title":"Adding covert security"},"33":{"body":"Without loss of generality let us recall the Multiplication-To-Addition (M2A) protocol, but our observations also apply to the Addition-To-Multiplication (A2M) protocol, which is very similar. We start with a short review of the M2A protocol. Let there be a sender with some field element a and some receiver with another field element b. After protocol execution the sender ends up with x and the receiver ends up with y, so that a⋅b=x+y. a,b,x,y∈F r - rng seed m - bit-length of elements in F n - bit-length of rng seed OT Sender with input a∈F,r←{0,1}n Sample some random masks: si​=rng(r,i),0≤i<m,si​∈F For every si​ compute: ti0​=si​ ti1​=a⋅2i+si​ Compute new share: x=−∑si​ Send i OTs to receiver: (ti0​,ti1​) OT Receiver with input b∈F Set vi​=tibi​​ (from OT) Compute new share: y=∑vi​","breadcrumbs":"Finite-Field Arithmetic » M2A Protocol Review","id":"33","title":"M2A Protocol Review"},"34":{"body":"In order to mitigate the mentioned protocol deviations in the case of a malicious sender we will introduce a replay protocol. In this section we will use capital letters for values sent in the replay protocol, which in the case of an honest sender are equal to their lowercase counterparts. The idea for the replay protocol is that at some point after the conversion protocol, the sender has to reveal the rng seed r and his input a to the receiver. In order to do this, he will send R and A to the receiver after the conversion protocol has been executed. If the sender is honest then of course r==R and a==A. The receiver can then check if the value he picked during protocol execution does match what he can now reconstruct from R and A, i.e. that Tibi​​==tibi​​. Using this replay protocol the sender at some point reveals all his secrets because he sends his rng seed and protocol input to the receiver. This means that we can only use covertly secure share conversion with replay as a sub-protocol if it is acceptable for the outer protocol, that the input to share-conversion becomes public at some later point. Now in practice we often want to execute several rounds of share-conversion, as we need to convert several field elements. Because of this we let the sender use the same rng seed r to seed his rng once and then he uses this rng instance for all protocol rounds. This means we have l protocol executions an​⋅bn​=xn​+yn​, and all masks sn,i​ produced from this rng seed r. So the sender will write his seed R and all the An​ to some tape, which in the end is sent to the receiver. As a security precaution we also let the sender commit to his rng seed before the first protocol execution. In detail: Sender Sender has some inputs an​ and picks some rng seed r. Sender commits to his rng seed and sends the commitment to the receiver. Sender sends all his OTs for n protocol executions. Sender sends tape which contains the rng seed R and all the An​. Receiver Receiver checks that R is indeed the committed rng seed. For every protocol execution l the receiver checks that Tn,ibn,i​​==tn,ibn,i​​. Having a look at the ways a malicious sender could cheat from earlier, we notice: The sender can no longer impose an arbitrary field element b′ onto the receiver, because the receiver would notice that t=T during the replay. The sender can still carry out a selective-failure attack, but this is equivalent to guessing k bits of b at random with a probability of 2−k for being undetected. The sender is now forced to use an rng seed to produce the masks, because during the replay, these masks are reproduced from R and indirectly checked via t==T.","breadcrumbs":"Finite-Field Arithmetic » Replay protocol","id":"34","title":"Replay protocol"},"35":{"body":"TLSNotary uses the DEAP protocol described below to ensure malicious security of the overall protocol. When using DEAP in TLSNotary, the User plays the role of Alice and has full privacy and the Notary plays the role of Bob and reveals all of his private inputs after the TLS session with the server is over. The Notary's private input is his TLS session key share. The parties run the Setup and Execution steps of DEAP but they defer the Equality Check. Since during the Equality Check all of the Notary's secrets are revealed to User, it must be deferred until after the TLS session with the server is over, otherwise the User would learn the full TLS session keys and be able to forge the TLS transcript.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Dual Execution with Asymmetric Privacy","id":"35","title":"Dual Execution with Asymmetric Privacy"},"36":{"body":"Malicious secure 2-party computation with garbled circuits typically comes at the expense of dramatically lower efficiency compared to execution in the semi-honest model. One technique, called Dual Execution [MF06] [HKE12] , achieves malicious security with a minimal 2x overhead. However, it comes with the concession that a malicious adversary may learn k bits of the other's input with probability 2−k. We present a variant of Dual Execution which provides different trade-offs. Our variant ensures complete privacy for one party , by sacrificing privacy entirely for the other. Hence the name, Dual Execution with Asymmetric Privacy (DEAP). During the execution phase of the protocol both parties have private inputs. The party with complete privacy learns the authentic output prior to the final stage of the protocol. In the final stage, prior to the equality check, one party reveals their private input. This allows a series of consistency checks to be performed which guarantees that the equality check can not cause leakage. Similarly to standard DualEx, our variant ensures output correctness and detects leakage (of the revealing parties input) with probability 1−2−k where k is the number of bits leaked.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Introduction","id":"36","title":"Introduction"},"37":{"body":"The protocol takes place between Alice and Bob who want to compute f(x,y) where x and y are Alice and Bob's inputs respectively. The privacy of Alice's input is ensured, while Bob's input will be revealed in the final steps of the protocol.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Preliminary","id":"37","title":"Preliminary"},"38":{"body":"Firstly, our protocol assumes a small amount of premature leakage of Bob's input is tolerable. By premature, we mean prior to the phase where Bob is expected to reveal his input. If Alice is malicious, she has the opportunity to prematurely leak k bits of Bob's input with 2−k probability of it going undetected.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Premature Leakage","id":"38","title":"Premature Leakage"},"39":{"body":"We assume that it is acceptable for either party to cause the protocol to abort at any time, with the condition that no information of Alice's inputs are leaked from doing so.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Aborts","id":"39","title":"Aborts"},"4":{"body":"By participating in the secure multi-party computation (MPC) for TLS communication, the Notary can validate the authenticity and integrity of the User's communication with the Server. If the User was honest, the Notary signs the transcript of the entire TLS session. Since the Notary only validates encrypted data, this process is referred to as \"blind signing\".","breadcrumbs":"Introduction » ② Notarization","id":"4","title":"② Notarization"},"40":{"body":"In the last phase of our protocol Bob must open all oblivious transfers he sent to Alice. To achieve this, we require a very relaxed flavor of committed oblivious transfer. For more detail on these relaxations see section 2 of Zero-Knowledge Using Garbled Circuits [JKO13] .","breadcrumbs":"Dual Execution with Asymmetric Privacy » Committed Oblivious Transfer","id":"40","title":"Committed Oblivious Transfer"},"41":{"body":"x and y are Alice and Bob's inputs, respectively. [X]A​ denotes an encoding of x chosen by Alice. [x] and [y] are Alice and Bob's encoded active inputs, respectively, ie Enc(x,[X])=[x]. comx​ denotes a binding commitment to x G denotes a garbled circuit for computing f(x,y)=v, where: Gb([X],[Y])=G Ev(G,[x],[y])=[v]. d denotes output decoding information where De(d,[v])=v Δ denotes the global offset of a garbled circuit where ∀i:[x]i1​=[x]i0​⊕Δ PRG denotes a secure pseudo-random generator H denotes a secure hash function","breadcrumbs":"Dual Execution with Asymmetric Privacy » Notation","id":"41","title":"Notation"},"42":{"body":"The protocol can be thought of as three distinct phases: The setup phase, execution, and equality-check.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Protocol","id":"42","title":"Protocol"},"43":{"body":"Alice creates a garbled circuit GA​ with corresponding input labels ([X]A​,[Y]A​), and output label commitment com[V]A​​. Bob creates a garbled circuit GB​ with corresponding input labels ([X]B​,[Y]B​). For committed OT, Bob picks a seed ρ and uses it to generate all random-tape for his OTs with PRG(ρ). Bob sends comρ​ to Alice. Alice retrieves her active input labels [x]B​ from Bob using OT. Bob retrieves his active input labels [y]A​ from Alice using OT. Alice sends GA​, [x]A​, dA​ and com[V]A​​ to Bob. Bob sends GB​, [y]B​, and dB​ to Alice.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Setup","id":"43","title":"Setup"},"44":{"body":"Both Alice and Bob can execute this phase of the protocol in parallel as described below: Alice Evaluates GB​ using [x]B​ and [y]B​ to acquire [v]B​. Decodes [v]B​ to vB using dB​ which she received earlier. She computes H([vB]A​,[v]B​) which we will call checkA​. Computes a commitment Com(checkA​,r)=comcheckA​​ where r is a key only known to Alice. She sends this commitment to Bob. Waits to receive [v]A​ from Bob [1] . Checks that [v]A​ is authentic, aborting if not, then decodes [v]A​ to vA using dA​. At this stage, if Bob is malicious, Alice could detect that vA=vB. However, Alice must not react in this case. She proceeds with the protocol regardless, having the authentic output vA. Bob Evaluates GA​ using [x]A​ and [y]A​ to acquire [v]A​. He checks [v]A​ against the commitment com[V]A​​ which Alice sent earlier, aborting if it is invalid. Decodes [v]A​ to vA using dA​ which he received earlier. He computes H([v]A​,[vA]B​) which we'll call checkB​, and stores it for the equality check later. Sends [v]A​ to Alice [1] . Receives comcheckA​​ from Alice and stores it for the equality check later. Bob, even if malicious, has learned nothing except the purported output vA and is not convinced it is correct. In the next phase Alice will attempt to convince Bob that it is. Alice, if honest, has learned the correct output v thanks to the authenticity property of garbled circuits. Alice, if malicious, has potentially learned Bob's entire input y. This is a significant deviation from standard DualEx protocols such as [HKE12] . Typically the output labels are not returned to the Generator, instead, output authenticity is established during a secure equality check at the end. See the section below for more detail.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Execution","id":"44","title":"Execution"},"45":{"body":"Bob opens his garbled circuit and OT by sending ΔB​, y and ρ to Alice. Alice, can now derive the purported input labels to Bob's garbled circuit ([X]B∗​,[Y]B∗​). Alice uses ρ to open all of Bob's OTs for [x]B​ and verifies that they were performed honestly. Otherwise she aborts. Alice verifies that GB​ was garbled honestly by checking Gb([X]B∗​,[Y]B∗​)==GB​. Otherwise she aborts. Alice now opens comcheckA​​ by sending checkA​ and r to Bob. Bob verifies comcheckA​​ then asserts checkA​==checkB​, aborting otherwise. Bob is now convinced that vA is correct, ie f(x,y)=vA. Bob is also assured that Alice only learned up to k bits of his input prior to revealing, with a probability of 2−k of it being undetected.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Equality Check","id":"45","title":"Equality Check"},"46":{"body":"","breadcrumbs":"Dual Execution with Asymmetric Privacy » Analysis","id":"46","title":"Analysis"},"47":{"body":"On the Leakage of Corrupted Garbled Circuits [DPB18] is recommended reading on this topic. During the first execution, Alice has some degrees of freedom in how she garbles GA​. According to [DPB18], when using a modern garbling scheme such as [ZRE15], these corruptions can be analyzed as two distinct classes: detectable and undetectable. Recall that our scheme assumes Bob's input is an ephemeral secret which can be revealed at the end. For this reason, we are entirely unconcerned about the detectable variety. Simply providing Bob with the output labels commitment com[V]A​​ is sufficient to detect these types of corruptions. In this context, our primary concern is regarding the correctness of the output of GA​. [DPB18] shows that any undetectable corruption made to GA​ is constrained to the arbitrary insertion or removal of NOT gates in the circuit, such that GA​ computes fA​ instead of f. Note that any corruption of dA​ has an equivalent effect. [DPB18] also shows that Alice's ability to exploit this is constrained by the topology of the circuit. Recall that in the final stage of our protocol Bob checks that the output of GA​ matches the output of GB​, or more specifically: fA​(x1​,y1​)==fB​(x2​,y2​) For the moment we'll assume Bob garbles honestly and provides the same inputs for both evaluations. fA​(x1​,y)==f(x2​,y) In the scenario where Bob reveals the output of fA​(x1​,y) prior to Alice committing to x2​ there is a trivial adaptive attack available to Alice. As an extreme example, assume Alice could choose fA​ such that fA​(x1​,y)=y. For most practical functions this is not possible to garble without detection, but for the sake of illustration we humor the possibility. In this case she could simply compute x2​ where f(x2​,y)=y in order to pass the equality check. To address this, Alice is forced to choose fA​, x1​ and x2​ prior to Bob revealing the output. In this case it is obvious that any valid combination of (fA​,x1​,x2​) must satisfy all constraints on y. Thus, for any non-trivial f, choosing a valid combination would be equivalent to guessing y correctly. In which case, any attack would be detected by the equality check with probability 1−2−k where k is the number of guessed bits of y. This result is acceptable within our model as explained earlier .","breadcrumbs":"Dual Execution with Asymmetric Privacy » Malicious Alice","id":"47","title":"Malicious Alice"},"48":{"body":"Zero-Knowledge Using Garbled Circuits [JKO13] is recommended reading on this topic. The last stage of our variant is functionally equivalent to the protocol described in [JKO13]. After Alice evaluates GB​ and commits to [v]B​, Bob opens his garbled circuit and all OTs entirely. Following this, Alice performs a series of consistency checks to detect any malicious behavior. These consistency checks do not depend on any of Alice's inputs, so any attempted selective failure attack by Bob would be futile. Bob's only options are to behave honestly, or cause Alice to abort without leaking any information.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Malicious Bob","id":"48","title":"Malicious Bob"},"49":{"body":"They deserve whatever they get.","breadcrumbs":"Dual Execution with Asymmetric Privacy » Malicious Alice & Bob","id":"49","title":"Malicious Alice & Bob"},"5":{"body":"The TLSNotary protocol provides a means for the User to selectively prove the authenticity of arbitrary sections of the transcript to a Verifier. In this context, the User is often referred to as the Prover. The User can redact sections of the transcript, thereby not disclosing sensitive data to the Verifier. This capability can be paired with Zero-Knowledge Proofs to prove properties of the redacted data without revealing the data itself.","breadcrumbs":"Introduction » ③ Selective Disclosure","id":"5","title":"③ Selective Disclosure"},"50":{"body":"Here we will explain our protocol for 2PC encryption using a block cipher in counter-mode. Our documentation on Dual Execution with Asymmetric Privacy is recommended prior reading for this section.","breadcrumbs":"Encryption » Encryption","id":"50","title":"Encryption"},"51":{"body":"","breadcrumbs":"Encryption » Preliminary","id":"51","title":"Preliminary"},"52":{"body":"It is important to recognise that the Notary's keyshare is an ephemeral secret . It is only private for the duration of the User's TLS session, after which the User is free to learn it without affecting the security of the protocol. It is this fact which allows us to achieve malicious security for relatively low cost. More details on this here .","breadcrumbs":"Encryption » Ephemeral Keyshare","id":"52","title":"Ephemeral Keyshare"},"53":{"body":"A small amount of undetected premature keyshare leakage is quite tolerable. For example, if the Notary leaks 3 bits of their keyshare, it gives the User no meaningful advantage in any attack, as she could have simply guessed the bits correctly with 2−3=12.5% probability and mounted the same attack. Assuming a sufficiently long cipher key is used, eg. 128 bits, this is not a concern. The equality check at the end of our protocol ensures that premature leakage is detected with a probability of 1−2−k where k is the number of leaked bits. The Notary is virtually guaranteed to detect significant leakage and can abort prior to notarization.","breadcrumbs":"Encryption » Premature Leakage","id":"53","title":"Premature Leakage"},"54":{"body":"Our protocol assures no leakage of the plaintext to the Notary during both encryption and decryption. The Notary reveals their keyshare at the end of the protocol, which allows the Notary to open their garbled circuits and oblivious transfers completely to the User. The User can then perform a series of consistency checks to ensure that the Notary behaved honestly. Because these consistency checks do not depend on any inputs of the User, aborting does not reveal any sensitive information (in contrast to standard DualEx which does).","breadcrumbs":"Encryption » Plaintext Leakage","id":"54","title":"Plaintext Leakage"},"55":{"body":"During the entirety of the TLS session the User performs the role of the garbled circuit generator, thus ensuring that a malicious Notary can not corrupt or otherwise compromise the integrity of messages sent to/from the Server.","breadcrumbs":"Encryption » Integrity","id":"55","title":"Integrity"},"56":{"body":"p is one block of plaintext c is the corresponding block of ciphertext, ie c=Enc(k,ctr)⊕p k is the cipher key ctr is the counter block kU​ and kN​ denote the User and Notary cipher keyshares, respectively, where k=kU​⊕kN​ z is a mask randomly selected by the User ectr is the encrypted counter-block, ie ectr=Enc(k,ctr) Enc denotes the block cipher used by the TLS session comx​ denotes a binding commitment to the value x [x]A​ denotes a garbled encoding of x chosen by party A","breadcrumbs":"Encryption » Notation","id":"56","title":"Notation"},"57":{"body":"The encryption protocol uses DEAP without any special variations. The User and Notary directly compute the ciphertext for each block of a message the User wishes to send to the Server: f(kU​,kN​,ctr,p)=Enc(kU​⊕kN​,ctr)⊕p=c The User creates a commitment to the plaintext active labels for the Notary's circuit Com([p]N​,r)=com[p]N​​ where r is a random key known only to the User. The User sends this commitment to the Notary to be used in the authdecode protocol later. It's critical that the User commits to [p]N​ prior to the Notary revealing Δ in the final phase of DEAP. This ensures that if com[p]N​​ is a commitment to valid labels, then it must be a valid commitment to the plaintext p. This is because learning the complementary wire label for any bit of p prior to learning Δ is virtually impossible.","breadcrumbs":"Encryption » Encryption Protocol","id":"57","title":"Encryption Protocol"},"58":{"body":"The protocol for decryption is very similar but has some key differences to encryption. For decryption, DEAP is used for every block of the ciphertext to compute the masked encrypted counter-block : f(kU​,kN​,ctr,z)=Enc(kU​⊕kN​,ctr)⊕z=ectrz​ This mask z, chosen by the User, hides ectr from the Notary and thus the plaintext too. Conversely, the User can simply remove this mask in order to compute the plaintext p=c⊕ectrz​⊕z. Following this, the User can retrieve the wire labels [p]N​ from the Notary using OT. Similarly to the procedure for encryption, the User creates a commitment Com([p]N​,r)=com[p]N​​ where r is a random key known only to the User. The User sends this commitment to the Notary to be used in the authdecode protocol later.","breadcrumbs":"Encryption » Decryption Protocol","id":"58","title":"Decryption Protocol"},"59":{"body":"In addition to computing the masked encrypted counter-block, the User must also prove that the labels [p]N​ they chose afterwards actually correspond to the ciphertext c sent by the Server. This is can be done efficiently in one execution using the zero-knowledge protocol described in [JKO13] the same as we do in the final phase of DEAP. The Notary garbles a circuit GN​ which computes: p⊕ectr=c Notice that the User and Notary will already have computed ectr when they computed ectrz​ earlier. Conveniently, the Notary can re-use the garbled labels [ectr]N​ as input labels for this circuit. For more details on the reuse of garbled labels see [AMR17] .","breadcrumbs":"Encryption » Proving the validity of [p]N​","id":"59","title":"Proving the validity of [p]N​"},"6":{"body":"A Verifier validates the proof received from the User. By comparing the signature against the Notary's public key, the Verifier ensures that the User did not tamper with the data. The data origin can be verified by inspecting the Server certificate through trusted certificate authorities (CAs).","breadcrumbs":"Introduction » ④ Verification","id":"6","title":"④ Verification"},"60":{"body":"What is a MAC How a MAC is computed in AES-GCM Computing MAC using secure two-party computation (2PC)","breadcrumbs":"MAC » Computing MAC in 2PC","id":"60","title":"Computing MAC in 2PC"},"61":{"body":"When sending an encrypted ciphertext to the Webserver, the User attaches a checksum to it. The Webserver uses this checksum to check whether the ciphertext has been tampered with while in transit. This checksum is known as the \"authentication tag\" and also as the \"Message Authentication Code\" (MAC). In order to create a MAC for some ciphertext not only the ciphertext but also some secret key is used as an input. This makes it impossible to forge some ciphertext without knowing the secret key. The first few paragraphs of this article explain what would happen if there was no MAC: it would be possible for a malicious actor to modify the plaintext by flipping certain bits of the ciphertext .","breadcrumbs":"MAC » 1. What is a MAC","id":"61","title":"1. What is a MAC"},"62":{"body":"In TLS the plaintext is split up into chunks called \"TLS records\". Each TLS record is encrypted and a MAC is computed for the ciphertext. The MAC (in AES-GCM) is obtained by XORing together the GHASH output and the GCTR output. Let's see how each of those outputs is computed:","breadcrumbs":"MAC » 2. How a MAC is computed in AES-GCM","id":"62","title":"2. How a MAC is computed in AES-GCM"},"63":{"body":"The GCTR output is computed by simply AES-ECB encrypting a counter block with the counter set to 1 (the iv, nonce and AES key are the same as for the rest of the TLS record).","breadcrumbs":"MAC » 2.1 GCTR output","id":"63","title":"2.1 GCTR output"},"64":{"body":"The GHASH output is the output of the GHASH function described in the NIST publication in section 6.4 in this way: \"In effect, the GHASH function calculates X1​•Hm⊕X2​•Hm−1⊕...⊕Xm−1​•H2⊕Xm​•H\". H and X are elements of the extension field GF(2128). \"•\" is a special type of multiplication called multiplication in a finite field described in section 6.3 of the NIST publication. ⊕ is addition in a finite field and it is defined as XOR. In other words, GHASH splits up the ciphertext into 16-byte blocks, each block is numbered X1​,X2​,... etc. There's also H which is called the GHASH key, which just is the AES-encrypted zero-block. We need to raise H to as many powers as there are blocks, i.e. if we have 5 blocks then we need 5 powers: H,H2,H3,H4,H5. Each block is multiplied by the corresponding power and all products are summed together. Below is the pseudocode for multiplying two 128-bit field elements x and y in GF(2128): 1. result = 0\n2. R = 0xE1000000000000000000000000000000\n3. bit_length = 128\n4. for i=0 upto bit_length-1\n5. if y[i] == 1\n6. result ^= x\n7. x = (x >> 1) ^ ((x & 1) * R)\n8. return result Standard math properties hold in finite field math, viz. commutative: a+b=b+a and distributive: a(b+c)=ab+ac.","breadcrumbs":"MAC » 2.2 GHASH output","id":"64","title":"2.2 GHASH output"},"65":{"body":"The goal of the protocol is to compute the MAC in such a way that neither party would learn the other party's share of H i.e. the GHASH key share. At the start of the protocol each party has: ciphertext blocks X1​,X2​,...,Xm​. XOR share of H: the User has Hu​ and the Notary has Hn​. XOR share of the GCTR output: the User has GCTRu​ and the Notary has GCTRn​. Note that 2. and 3. were obtained at an earlier stage of the TLSNotary protocol.","breadcrumbs":"MAC » 3. Computing MAC using secure two-party computation (2PC)","id":"65","title":"3. Computing MAC using secure two-party computation (2PC)"},"66":{"body":"To illustrate what we want to achieve, we consider the case of just having a single ciphertext block X1​. The GHASH_output will be: X1​•H=X1​•(Hu​⊕Hn​)=X1​•Hu​⊕X1​•Hn​ The User and the Notary will compute locally the left and the right terms respectively. Then each party will XOR their result to the GCTR output share and will get their XOR share of the MAC: User : X1​•Hu​⊕GCTRu​=MACu​ Notary: X1​•Hn​⊕GCTRn​=MACn​ Finally, the Notary sends MACn​ to the User who obtains: MAC=MACn​⊕MACu​ For longer ciphertexts, the problem is that higher powers of the hashkey Hk cannot be computed locally, because we deal with additive sharings, i.e.(Hu​)k⊕(Hn​)k=Hk.","breadcrumbs":"MAC » 3.1 Example with a single ciphertext block","id":"66","title":"3.1 Example with a single ciphertext block"},"67":{"body":"We now introduce our 2PC MAC protocol for computing ciphertexts with an arbitrary number of blocks. Our protocol can be divided into the following steps. Steps First, both parties convert their additive shares Hu​ and Hn​ into multiplicative shares Hu​ and Hn​. This allows each party to locally compute the needed higher powers of these multiplicative shares, i.e for m blocks of ciphertext: the user computes Hu​​2,Hu​​3,...Hu​​m the notary computes Hn​​2,Hn​​3,...Hn​​m Then both parties convert each of these multiplicative shares back to additive shares the user ends up with Hu​,Hu2​,...Hum​ the notary ends up with Hn​,Hn2​,...Hnm​ Each party can now locally compute their additive MAC share MACn/u​. The conversion steps ( 1 and 3 ) require communication between the user and the notary. They will use A2M (Addition-to-Multiplication) and M2A (Multiplication-to-Addition) protocols, which make use of oblivious transfer , to convert the shares. The user will be the sender and the notary the receiver. 2PC MAC Overview 3.2.1 (A2M) Convert additive shares of H into multiplicative share At first (step 1 ) we have to get a multiplicative share of Hn/u​, so that notary and user can locally compute the needed higher powers. For this we use an adapted version of the A2M protocol in chapter 4 of Efficient Secure Two-Party Exponentiation . The user will decompose his share into i individual oblivious transfers tu,ik​=R⋅(k⋅2i+Hu,i​⋅2i⊕si​), where R is some random value used for all oblivious transfers si​ is a random mask used per oblivious transfer, with ∑i​si​=0 k∈0,1 depending on the receiver's choice. The notary's choice in the i-th OT will depend on the bit value in the i-th position of his additive share Hn​. In the end the multiplicative share of the user Hu​​ will simply be the inverse R−1 of the random value, and the notary will sum all his OT outputs, so that all the si​ will vanish and hence he gets his multiplicative share Hn​​. H​=Hu​⊕Hn​=R−1⋅R⋅i∑​(Hu,i​⊕Hn,i​)⋅2i⊕si​=R−1⋅i∑​tu,iHn,i​​⊕R⋅i∑​si​=Hu​​⋅Hn​​​​ 3.2.2 (M2A) Convert multiplicative shares Hk into additive shares In step 3 of our protocol, we use the oblivious transfer method described in chapter 4.1 of the Gilboa paper Two Party RSA Key Generation to convert all the multiplicative shares Hn/uk​​ back into additive shares Hn/uk​. We only show how the method works for the share Hn/u1​​, because it is the same for higher powers. The user will be the OT sender and decompose his shares into i individual oblivious transfers tu,ik​=k⋅Hu​​⋅2i+si​, where k∈0,1, depending on the receiver's choices. Each of these OTs is masked with a random value si​. He will then obliviously send them to the notary. Depending on the binary representation of his multiplicative share, the notary will choose one of the choices and do this for all 128 oblivious transfers. After that the user will locally XOR all his si​ and end up with his additive share Hu​, and the notary will do the same for all the results of the oblivious transfers and get Hn​. H​=Hu​​⋅Hn​​=Hu​​⋅i∑​Hn,i​​⋅2i=i∑​(Hn,i​​⋅Hu​​⋅2i⊕si​)⊕i∑​si​=i∑​tu,iHn,i​​​⊕i∑​si​≡Hn​⊕Hu​​","breadcrumbs":"MAC » 3.2 Computing ciphertexts with an arbitrary number of blocks","id":"67","title":"3.2 Computing ciphertexts with an arbitrary number of blocks"},"68":{"body":"In the actual implementation of the protocol we only compute odd multiplicative shares, i.e. H,H3,H5,…, so that we only need to share these odd shares in step 3 . This is possible because we can compute even additive shares from odd additive shares. We observe that for even k: Hk​=(Hnk/2​⊕Huk/2​)2=(Hnk/2​)2⊕Hnk/2​Huk/2​⊕Huk/2​Hnk/2​⊕(Huk/2​)2=(Hnk/2​)2⊕(Huk/2​)2=Hnk​⊕Huk​​​ So we only need to convert odd multiplicative shares into odd additive shares, which gives us a 50% reduction in cost. The remaining even additive shares can then be computed locally.","breadcrumbs":"MAC » 3.3 Free Squaring","id":"68","title":"3.3 Free Squaring"},"69":{"body":"Both the A2M and M2A protocols on their own only provide semi-honest security. They are secure against a malicious receiver, but the sender has degrees of freedom to cause leakage of the MAC keyshares. However, for our purposes this does not present a problem as long as leakage is detected. To detect a malicious sender, we require the sender to commit to the PRG seed used to generate the random values in the share conversion protocols. After the TLS session is closed the MAC keyshares are no longer secret, which allows the sender to reveal this seed to the receiver. Subsequently, the receiver can perform a consistency check to make sure the sender followed the protocol honestly. 3.3.1 Malicious notary The protocol is secure against a malicious notary, because he is the OT receiver, which means that there is actually no input from him during the protocol execution except for the final MAC output. He just receives the OT input from the user, so the only thing he can do is to provide a wrong MAC keyshare. This will cause the server to reject the MAC when the user sends the request. The protocol simply aborts. 3.3.2 Malicious user A malicious user could actually manipulate what he sends in the OT and potentially endanger the security of the protocol by leaking the notary's MAC key. To address this we force the user to reveal his MAC key after the server response so that the notary can check for the correctness of the whole MAC 2PC protocol. Then if the notary detects that the user cheated, he would simply abort the protocol. 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