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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../../../../index.html">Introduction</a></li><li class="chapter-item expanded "><a href="../../../../vac/index.html"><strong aria-hidden="true">1.</strong> Vac</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../vac/1/coss.html"><strong aria-hidden="true">1.1.</strong> 1/COSS</a></li><li class="chapter-item expanded "><a href="../../../../vac/2/mvds.html"><strong aria-hidden="true">1.2.</strong> 2/MVDS</a></li><li class="chapter-item expanded "><a href="../../../../vac/3/remote-log.html"><strong aria-hidden="true">1.3.</strong> 3/Remote Log</a></li><li class="chapter-item expanded "><a href="../../../../vac/4/mvds-meta.html"><strong aria-hidden="true">1.4.</strong> 4/MVDS Meta</a></li><li class="chapter-item expanded "><a href="../../../../vac/25/libp2p-dns-discovery.html"><strong aria-hidden="true">1.5.</strong> 25/Libp2p DNS Discovery</a></li><li class="chapter-item expanded "><a href="../../../../vac/32/rln-v1.html"><strong aria-hidden="true">1.6.</strong> 32/RLN-V1</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/index.html"><strong aria-hidden="true">1.7.</strong> Raw</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../vac/raw/consensus-hashgraphlike.html"><strong aria-hidden="true">1.7.1.</strong> Consensus Hashgraphlike</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/decentralized-messaging-ethereum.html"><strong aria-hidden="true">1.7.2.</strong> Decentralized Messaging Ethereum</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/eth-mls-offchain.html"><strong aria-hidden="true">1.7.3.</strong> ETH MLS Offchain</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/eth-mls-onchain.html"><strong aria-hidden="true">1.7.4.</strong> ETH MLS Onchain</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/deleted/eth-secpm.html"><strong aria-hidden="true">1.7.5.</strong> ETH SecPM</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/gossipsub-tor-push.html"><strong aria-hidden="true">1.7.6.</strong> Gossipsub Tor Push</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/logos-capability-discovery.html"><strong aria-hidden="true">1.7.7.</strong> Logos Capability Discovery</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/mix.html"><strong aria-hidden="true">1.7.8.</strong> Mix</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/noise-x3dh-double-ratchet.html"><strong aria-hidden="true">1.7.9.</strong> Noise X3DH Double Ratchet</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/rln-interep-spec.html"><strong aria-hidden="true">1.7.10.</strong> RLN Interep Spec</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/rln-stealth-commitments.html"><strong aria-hidden="true">1.7.11.</strong> RLN Stealth Commitments</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/rln-v2.html"><strong aria-hidden="true">1.7.12.</strong> RLN-V2</a></li><li class="chapter-item expanded "><a href="../../../../vac/raw/sds.html"><strong aria-hidden="true">1.7.13.</strong> SDS</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../vac/template.html"><strong aria-hidden="true">1.8.</strong> Template</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../waku/index.html"><strong aria-hidden="true">2.</strong> Waku</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../waku/standards/core/index.html"><strong aria-hidden="true">2.1.</strong> Standards - Core</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../waku/standards/core/10/waku2.html"><strong aria-hidden="true">2.1.1.</strong> 10/Waku2</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/11/relay.html"><strong aria-hidden="true">2.1.2.</strong> 11/Relay</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/12/filter.html"><strong aria-hidden="true">2.1.3.</strong> 12/Filter</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/13/store.html"><strong aria-hidden="true">2.1.4.</strong> 13/Store</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/14/message.html"><strong aria-hidden="true">2.1.5.</strong> 14/Message</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/15/bridge.html"><strong aria-hidden="true">2.1.6.</strong> 15/Bridge</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/17/rln-relay.html"><strong aria-hidden="true">2.1.7.</strong> 17/RLN Relay</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/19/lightpush.html"><strong aria-hidden="true">2.1.8.</strong> 19/Lightpush</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/31/enr.html"><strong aria-hidden="true">2.1.9.</strong> 31/ENR</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/33/discv5.html"><strong aria-hidden="true">2.1.10.</strong> 33/Discv5</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/34/peer-exchange.html"><strong aria-hidden="true">2.1.11.</strong> 34/Peer Exchange</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/36/bindings-api.html"><strong aria-hidden="true">2.1.12.</strong> 36/Bindings API</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/core/64/network.html"><strong aria-hidden="true">2.1.13.</strong> 64/Network</a></li><li class="chapter-item expanded "><a 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Sessions</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../waku/standards/legacy/index.html"><strong aria-hidden="true">2.3.</strong> Standards - Legacy</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../waku/standards/legacy/6/waku1.html"><strong aria-hidden="true">2.3.1.</strong> 6/Waku1</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/legacy/7/data.html"><strong aria-hidden="true">2.3.2.</strong> 7/Data</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/legacy/8/mail.html"><strong aria-hidden="true">2.3.3.</strong> 8/Mail</a></li><li class="chapter-item expanded "><a href="../../../../waku/standards/legacy/9/rpc.html"><strong aria-hidden="true">2.3.4.</strong> 9/RPC</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../waku/informational/index.html"><strong aria-hidden="true">2.4.</strong> Informational</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../waku/informational/22/toy-chat.html"><strong aria-hidden="true">2.4.1.</strong> 22/Toy Chat</a></li><li class="chapter-item expanded "><a href="../../../../waku/informational/23/topics.html"><strong aria-hidden="true">2.4.2.</strong> 23/Topics</a></li><li class="chapter-item expanded "><a href="../../../../waku/informational/27/peers.html"><strong aria-hidden="true">2.4.3.</strong> 27/Peers</a></li><li class="chapter-item expanded "><a href="../../../../waku/informational/29/config.html"><strong aria-hidden="true">2.4.4.</strong> 29/Config</a></li><li class="chapter-item expanded "><a href="../../../../waku/informational/30/adaptive-nodes.html"><strong aria-hidden="true">2.4.5.</strong> 30/Adaptive Nodes</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../waku/deprecated/index.html"><strong aria-hidden="true">2.5.</strong> Deprecated</a></li><li><ol class="section"><li class="chapter-item expanded "><a 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aria-hidden="true">3.1.1.</strong> NomosDA Encoding</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/nomosda-network.html"><strong aria-hidden="true">3.1.2.</strong> NomosDA Network</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/p2p-hardware-requirements.html"><strong aria-hidden="true">3.1.3.</strong> P2P Hardware Requirements</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/p2p-nat-solution.html"><strong aria-hidden="true">3.1.4.</strong> P2P NAT Solution</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/p2p-network-bootstrapping.html"><strong aria-hidden="true">3.1.5.</strong> P2P Network Bootstrapping</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/p2p-network.html"><strong aria-hidden="true">3.1.6.</strong> P2P Network</a></li><li class="chapter-item expanded "><a href="../../../../nomos/raw/sdp.html"><strong aria-hidden="true">3.1.7.</strong> SDP</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../nomos/deprecated/index.html"><strong aria-hidden="true">3.2.</strong> Deprecated</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../nomos/deprecated/claro.html"><strong aria-hidden="true">3.2.1.</strong> Claro</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../../codex/index.html"><strong aria-hidden="true">4.</strong> Codex</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../codex/raw/index.html"><strong aria-hidden="true">4.1.</strong> Raw</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../codex/raw/codex-block-exchange.html"><strong aria-hidden="true">4.1.1.</strong> Block Exchange</a></li><li class="chapter-item expanded "><a href="../../../../codex/raw/codex-marketplace.html"><strong aria-hidden="true">4.1.2.</strong> Marketplace</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../../../../status/index.html"><strong aria-hidden="true">5.</strong> Status</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../status/24/curation.html"><strong aria-hidden="true">5.1.</strong> 24/Curation</a></li><li class="chapter-item expanded "><a href="../../../../status/28/featuring.html"><strong aria-hidden="true">5.2.</strong> 28/Featuring</a></li><li class="chapter-item expanded "><a href="../../../../status/55/1to1-chat.html"><strong aria-hidden="true">5.3.</strong> 55/1-to-1 Chat</a></li><li class="chapter-item expanded "><a href="../../../../status/56/communities.html"><strong aria-hidden="true">5.4.</strong> 56/Communities</a></li><li class="chapter-item expanded "><a href="../../../../status/61/community-history-service.html"><strong aria-hidden="true">5.5.</strong> 61/Community History Service</a></li><li class="chapter-item expanded "><a href="../../../../status/62/payloads.html"><strong aria-hidden="true">5.6.</strong> 62/Payloads</a></li><li class="chapter-item expanded "><a href="../../../../status/63/keycard-usage.html"><strong aria-hidden="true">5.7.</strong> 63/Keycard Usage</a></li><li class="chapter-item expanded "><a href="../../../../status/65/account-address.html"><strong aria-hidden="true">5.8.</strong> 65/Account Address</a></li><li class="chapter-item expanded "><a href="../../../../status/71/push-notification-server.html"><strong aria-hidden="true">5.9.</strong> 71/Push Notification Server</a></li><li class="chapter-item expanded "><a href="../../../../status/raw/index.html"><strong aria-hidden="true">5.10.</strong> Raw</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../status/raw/simple-scaling.html"><strong aria-hidden="true">5.10.1.</strong> Simple Scaling</a></li><li class="chapter-item expanded "><a href="../../../../status/raw/status-app-protocols.html"><strong aria-hidden="true">5.10.2.</strong> Status App Protocols</a></li><li class="chapter-item expanded "><a href="../../../../status/raw/status-mvds.html"><strong aria-hidden="true">5.10.3.</strong> Status MVDS</a></li><li class="chapter-item expanded "><a href="../../../../status/raw/url-data.html"><strong aria-hidden="true">5.10.4.</strong> URL Data</a></li><li class="chapter-item expanded "><a href="../../../../status/raw/url-scheme.html"><strong aria-hidden="true">5.10.5.</strong> URL Scheme</a></li></ol></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/index.html"><strong aria-hidden="true">5.11.</strong> Deprecated</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../../../../status/deprecated/3rd-party.html"><strong aria-hidden="true">5.11.1.</strong> 3rd Party</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/account.html"><strong aria-hidden="true">5.11.2.</strong> Account</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/client.html"><strong aria-hidden="true">5.11.3.</strong> Client</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/dapp-browser-API-usage.html"><strong aria-hidden="true">5.11.4.</strong> Dapp Browser API Usage</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/eips.html"><strong aria-hidden="true">5.11.5.</strong> EIPs</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/ethereum-usage.html"><strong aria-hidden="true">5.11.6.</strong> Ethereum Usage</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/group-chat.html"><strong aria-hidden="true">5.11.7.</strong> Group Chat</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/IPFS-gateway-for-sticker-Pack.html"><strong aria-hidden="true">5.11.8.</strong> IPFS Gateway for Sticker Pack</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/keycard-usage-for-wallet-and-chat-keys.html"><strong aria-hidden="true">5.11.9.</strong> Keycard Usage for Wallet and Chat Keys</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/notifications.html"><strong aria-hidden="true">5.11.10.</strong> Notifications</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/payloads.html"><strong aria-hidden="true">5.11.11.</strong> Payloads</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/push-notification-server.html"><strong aria-hidden="true">5.11.12.</strong> Push Notification Server</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/secure-transport.html"><strong aria-hidden="true">5.11.13.</strong> Secure Transport</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/waku-mailserver.html"><strong aria-hidden="true">5.11.14.</strong> Waku Mailserver</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/waku-usage.html"><strong aria-hidden="true">5.11.15.</strong> Waku Usage</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/whisper-mailserver.html"><strong aria-hidden="true">5.11.16.</strong> Whisper Mailserver</a></li><li class="chapter-item expanded "><a href="../../../../status/deprecated/whisper-usage.html"><strong aria-hidden="true">5.11.17.</strong> Whisper Usage</a></li></ol></li></ol></li></ol>
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<script>
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document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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<div id="content" class="content">
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<main>
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<h1 id="54waku2-x3dh-sessions"><a class="header" href="#54waku2-x3dh-sessions">54/WAKU2-X3DH-SESSIONS</a></h1>
|
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<div class="table-wrapper"><table><thead><tr><th>Field</th><th>Value</th></tr></thead><tbody>
|
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<tr><td>Name</td><td>Session management for Waku X3DH</td></tr>
|
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<tr><td>Slug</td><td>54</td></tr>
|
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<tr><td>Status</td><td>draft</td></tr>
|
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<tr><td>Category</td><td>Standards Track</td></tr>
|
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<tr><td>Editor</td><td>Aaryamann Challani <a href="mailto:p1ge0nh8er@proton.me">p1ge0nh8er@proton.me</a></td></tr>
|
|
<tr><td>Contributors</td><td>Andrea Piana <a href="mailto:andreap@status.im">andreap@status.im</a>, Pedro Pombeiro <a href="mailto:pedro@status.im">pedro@status.im</a>, Corey Petty <a href="mailto:corey@status.im">corey@status.im</a>, Oskar Thorén <a href="mailto:oskarth@titanproxy.com">oskarth@titanproxy.com</a>, Dean Eigenmann <a href="mailto:dean@status.im">dean@status.im</a>, Filip Dimitrijevic <a href="mailto:filip@status.im">filip@status.im</a></td></tr>
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</tbody></table>
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</div><!-- timeline:start -->
|
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<h2 id="timeline"><a class="header" href="#timeline">Timeline</a></h2>
|
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<ul>
|
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<li><strong>2025-12-22</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/0f1855edcf68ef982c4ce478b67d660809aa9830/docs/waku/standards/application/54/x3dh-sessions.md"><code>0f1855e</code></a> — Chore/fix headers (#239)</li>
|
|
<li><strong>2025-12-22</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/b1a578393edf8487ccc97a5f25b25af9bf41efb3/docs/waku/standards/application/54/x3dh-sessions.md"><code>b1a5783</code></a> — Chore/mdbook updates (#237)</li>
|
|
<li><strong>2025-12-18</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/d03e699084774ebecef9c6d4662498907c5e2080/docs/waku/standards/application/54/x3dh-sessions.md"><code>d03e699</code></a> — ci: add mdBook configuration (#233)</li>
|
|
<li><strong>2025-04-24</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/db365cb756716fb76731c7988d41e9af9a850bc2/waku/standards/application/54/x3dh-sessions.md"><code>db365cb</code></a> — update waku/standards/application/54/x3dh-sessions.md (#151)</li>
|
|
<li><strong>2024-09-13</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/3ab314d87d4525ff1296bf3d9ec634d570777b91/waku/standards/application/54/x3dh-sessions.md"><code>3ab314d</code></a> — Fix Files for Linting (#94)</li>
|
|
<li><strong>2024-08-05</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/eb25cd06d679e94409072a96841de16a6b3910d5/waku/standards/application/54/x3dh-sessions.md"><code>eb25cd0</code></a> — chore: replace email addresses (#86)</li>
|
|
<li><strong>2024-03-21</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/2eaa7949c4abe7d14e2b9560e8c045bf2e937c9a/waku/standards/application/54/x3dh-sessions.md"><code>2eaa794</code></a> — Broken Links + Change Editors (#26)</li>
|
|
<li><strong>2024-02-01</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/0e490d46bb99c2fbae1ac193fbdfc11d84fb080d/waku/standards/application/54/x3dh-sessions.md"><code>0e490d4</code></a> — Rename X3DH-sessions.md to x3dh-sessions.md</li>
|
|
<li><strong>2024-01-31</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/7f8b187f1b8b77af0c88c9fb154144494a7dfb7d/waku/standards/application/54/X3DH-sessions.md"><code>7f8b187</code></a> — Update and rename README.md to X3DH-sessions.md</li>
|
|
<li><strong>2024-01-27</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/a22c2a0d79058ab435fcd38fe17a9f19021d5cd4/waku/standards/application/54/README.md"><code>a22c2a0</code></a> — Rename README.md to README.md</li>
|
|
<li><strong>2024-01-27</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/eef961bfe3b1cf6aab66df5450555afd1d3543cb/waku/standards/application/56/README.md"><code>eef961b</code></a> — remove rfs folder</li>
|
|
<li><strong>2024-01-25</strong> — <a href="https://github.com/vacp2p/rfc-index/blob/484df92848f90025fc538c19616fff904d72bc26/waku/rfcs/standards/application/56/README.md"><code>484df92</code></a> — Create README.md</li>
|
|
</ul>
|
|
<!-- timeline:end -->
|
|
<h2 id="abstract"><a class="header" href="#abstract">Abstract</a></h2>
|
|
<p>This document specifies how to manage sessions based on an X3DH key exchange.
|
|
This includes how to establish new sessions,
|
|
how to re-establish them, how to maintain them, and how to close them.</p>
|
|
<p><a href="/waku/standards/application/53/x3dh.html">53/WAKU2-X3DH</a> specifies the Waku <code>X3DH</code> protocol
|
|
for end-to-end encryption.
|
|
Once two peers complete an X3DH handshake, they SHOULD establish an X3DH session.</p>
|
|
<h2 id="session-establishment"><a class="header" href="#session-establishment">Session Establishment</a></h2>
|
|
<p>A node identifies a peer by their <code>installation-id</code>
|
|
which MAY be interpreted as a device identifier.</p>
|
|
<h3 id="discovery-of-pre-key-bundles"><a class="header" href="#discovery-of-pre-key-bundles">Discovery of pre-key bundles</a></h3>
|
|
<p>The node's pre-key bundle MUST be broadcast on a content topic
|
|
derived from the node's public key, so that the first message may be PFS-encrypted.
|
|
Each peer MUST publish their pre-key bundle periodically to this topic,
|
|
otherwise they risk not being able to perform key-exchanges with other peers.
|
|
Each peer MAY publish to this topic when their metadata changes,
|
|
so that the other peer can update their local record.</p>
|
|
<p>If peer A wants to send a message to peer B,
|
|
it MUST derive the topic from peer B's public key, which has been shared out of band.
|
|
Partitioned topics have been used to balance privacy and
|
|
efficiency of broadcasting pre-key bundles.</p>
|
|
<p>The number of partitions that MUST be used is 5000.</p>
|
|
<p>The topic MUST be derived as follows:</p>
|
|
<pre><code class="language-js">var partitionsNum *big.Int = big.NewInt(5000)
|
|
var partition *big.Int = big.NewInt(0).Mod(peerBPublicKey, partitionsNum)
|
|
|
|
partitionTopic := "contact-discovery-" + strconv.FormatInt(partition.Int64(), 10)
|
|
|
|
var hash []byte = keccak256(partitionTopic)
|
|
var topicLen int = 4
|
|
|
|
if len(hash) < topicLen {
|
|
topicLen = len(hash)
|
|
}
|
|
|
|
var contactCodeTopic [4]byte
|
|
for i = 0; i < topicLen; i++ {
|
|
contactCodeTopic[i] = hash[i]
|
|
}
|
|
</code></pre>
|
|
<h3 id="initialization"><a class="header" href="#initialization">Initialization</a></h3>
|
|
<p>A node initializes a new session once a successful X3DH exchange has taken place.
|
|
Subsequent messages will use the established session until re-keying is necessary.</p>
|
|
<h3 id="negotiated-topic-to-be-used-for-the-session"><a class="header" href="#negotiated-topic-to-be-used-for-the-session">Negotiated topic to be used for the session</a></h3>
|
|
<p>After the peers have performed the initial key exchange,
|
|
they MUST derive a topic from their shared secret to send messages on.
|
|
To obtain this value, take the first four bytes of the keccak256 hash
|
|
of the shared secret encoded in hexadecimal format.</p>
|
|
<pre><code class="language-js">sharedKey, err := ecies.ImportECDSA(myPrivateKey).GenerateShared(
|
|
ecies.ImportECDSAPublic(theirPublicKey),
|
|
16,
|
|
16,
|
|
)
|
|
|
|
hexEncodedKey := hex.EncodeToString(sharedKey)
|
|
|
|
var hash []byte = keccak256(hexEncodedKey)
|
|
var topicLen int = 4
|
|
|
|
if len(hash) < topicLen {
|
|
topicLen = len(hash)
|
|
}
|
|
|
|
var topic [4]byte
|
|
for i = 0; i < topicLen; i++ {
|
|
topic[i] = hash[i]
|
|
}
|
|
</code></pre>
|
|
<p>To summarize,
|
|
following is the process for peer B to establish a session with peer A:</p>
|
|
<ol>
|
|
<li>Listen to peer B's Contact Code Topic to retrieve their bundle information,
|
|
including a list of active devices</li>
|
|
<li>Peer A sends their pre-key bundle on peer B's partitioned topic</li>
|
|
<li>Peer A and peer B perform the key-exchange using the shared pre-key bundles</li>
|
|
<li>The negotiated topic is derived from the shared secret</li>
|
|
<li>Peers A & B exchange messages on the negotiated topic</li>
|
|
</ol>
|
|
<h3 id="concurrent-sessions"><a class="header" href="#concurrent-sessions">Concurrent sessions</a></h3>
|
|
<p>If a node creates two sessions concurrently between two peers,
|
|
the one with the symmetric key first in byte order SHOULD be used,
|
|
this marks that the other has expired.</p>
|
|
<h3 id="re-keying"><a class="header" href="#re-keying">Re-keying</a></h3>
|
|
<p>On receiving a bundle from a given peer with a higher version,
|
|
the old bundle SHOULD be marked as expired and
|
|
a new session SHOULD be established on the next message sent.</p>
|
|
<h3 id="multi-device-support"><a class="header" href="#multi-device-support">Multi-device support</a></h3>
|
|
<p>Multi-device support is quite challenging
|
|
as there is not a central place where information on which and how many devices
|
|
(identified by their respective <code>installation-id</code>) a peer has, is stored.</p>
|
|
<p>Furthermore, account recovery always needs to be taken into consideration,
|
|
where a user wipes clean the whole device and
|
|
the node loses all the information about any previous sessions.
|
|
Taking these considerations into account,
|
|
the way the network propagates multi-device information using X3DH bundles,
|
|
which will contain information about paired devices
|
|
as well as information about the sending device.
|
|
This means that every time a new device is paired,
|
|
the bundle needs to be updated and propagated with the new information,
|
|
the user has the responsibility to make sure the pairing is successful.</p>
|
|
<p>The method is loosely based on <a href="https://signal.org/docs/specifications/sesame/">Signal's Sesame Algorithm</a>.</p>
|
|
<h3 id="pairing"><a class="header" href="#pairing">Pairing</a></h3>
|
|
<p>A new <code>installation-id</code> MUST be generated on a per-device basis.
|
|
The device should be paired as soon as possible if other devices are present.</p>
|
|
<p>If a bundle is received, which has the same <code>IK</code> as the keypair present on the device,
|
|
the devices MAY be paired.
|
|
Once a user enables a new device,
|
|
a new bundle MUST be generated which includes pairing information.</p>
|
|
<p>The bundle MUST be propagated to contacts through the usual channels.</p>
|
|
<p>Removal of paired devices is a manual step that needs to be applied on each device,
|
|
and consist simply in disabling the device,
|
|
at which point pairing information will not be propagated anymore.</p>
|
|
<h3 id="sending-messages-to-a-paired-group"><a class="header" href="#sending-messages-to-a-paired-group">Sending messages to a paired group</a></h3>
|
|
<p>When sending a message,
|
|
the peer SHOULD send a message to other <code>installation-id</code> that they have seen.
|
|
The node caps the number of devices to <code>n</code>, ordered by last activity.
|
|
The node sends messages using pairwise encryption, including their own devices.</p>
|
|
<p>Where <code>n</code> is the maximum number of devices that can be paired.</p>
|
|
<h3 id="account-recovery"><a class="header" href="#account-recovery">Account recovery</a></h3>
|
|
<p>Account recovery is the same as adding a new device,
|
|
and it MUST be handled the same way.</p>
|
|
<h3 id="partitioned-devices"><a class="header" href="#partitioned-devices">Partitioned devices</a></h3>
|
|
<p>In some cases
|
|
(i.e. account recovery when no other pairing device is available, device not paired),
|
|
it is possible that a device will receive a message
|
|
that is not targeted to its own <code>installation-id</code>.
|
|
In this case an empty message containing bundle information MUST be sent back,
|
|
which will notify the receiving end not to include the device in any further communication.</p>
|
|
<h2 id="security-considerations"><a class="header" href="#security-considerations">Security Considerations</a></h2>
|
|
<ol>
|
|
<li>Inherits all security considerations from <a href="/waku/standards/application/53/x3dh.html">53/WAKU2-X3DH</a>.</li>
|
|
</ol>
|
|
<h3 id="recommendations"><a class="header" href="#recommendations">Recommendations</a></h3>
|
|
<ol>
|
|
<li>The value of <code>n</code> SHOULD be configured by the app-protocol.
|
|
<ul>
|
|
<li>The default value SHOULD be 3,
|
|
since a larger number of devices will result in a larger bundle size,
|
|
which may not be desirable in a peer-to-peer network.</li>
|
|
</ul>
|
|
</li>
|
|
</ol>
|
|
<h2 id="copyright"><a class="header" href="#copyright">Copyright</a></h2>
|
|
<p>Copyright and related rights waived via
|
|
<a href="https://creativecommons.org/publicdomain/zero/1.0/">CC0</a>.</p>
|
|
<h2 id="references"><a class="header" href="#references">References</a></h2>
|
|
<ul>
|
|
<li><a href="/waku/standards/application/53/x3dh.html">53/WAKU2-X3DH</a></li>
|
|
<li><a href="https://signal.org/docs/specifications/sesame/">Signal's Sesame Algorithm</a></li>
|
|
</ul>
|
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