diff --git a/app/package.json b/app/package.json
index 31d66df6f..f39e34aa0 100644
--- a/app/package.json
+++ b/app/package.json
@@ -40,6 +40,7 @@
     "react": "18.2.0",
     "react-native": "0.72.3",
     "react-native-canvas": "^0.1.39",
+    "react-native-dialog": "^9.3.0",
     "react-native-fs": "^2.20.0",
     "react-native-get-random-values": "^1.11.0",
     "react-native-keychain": "^8.2.0",
diff --git a/app/src/screens/MainScreen.tsx b/app/src/screens/MainScreen.tsx
index 64bdc2451..6d7e59d83 100644
--- a/app/src/screens/MainScreen.tsx
+++ b/app/src/screens/MainScreen.tsx
@@ -1,11 +1,10 @@
 import React, { useState, useEffect } from 'react';
 import { YStack, XStack, Text, Button, Tabs, Sheet, Label, Fieldset, Input, Switch, H2, Image, useWindowDimensions, H4, H3 } from 'tamagui'
-import { HelpCircle, IterationCw, VenetianMask, Cog, CheckCircle2, ChevronLeft } from '@tamagui/lucide-icons';
+import { HelpCircle, IterationCw, VenetianMask, Cog, CheckCircle2, ChevronLeft, Share } from '@tamagui/lucide-icons';
 import X from '../images/x.png'
 import Telegram from '../images/telegram.png'
 import Github from '../images/github.png'
 import Internet from "../images/internet.png"
-import ScanScreen from './ScanScreen';
 import ProveScreen from './ProveScreen';
 import { Steps } from '../utils/utils';
 import AppScreen from './AppScreen';
@@ -22,10 +21,14 @@ import useNavigationStore from '../stores/navigationStore';
 import NfcScreen from './NfcScreen';
 import CameraScreen from './CameraScreen';
 import { mockPassportData_sha256WithRSAEncryption_65537 } from '../../../common/src/utils/mockPassportData';
+import Dialog from "react-native-dialog";
+import { contribute } from '../utils/contribute';
+
 
 const MainScreen: React.FC = () => {
   const [NFCScanIsOpen, setNFCScanIsOpen] = useState(false);
   const [SettingsIsOpen, setSettingsIsOpen] = useState(false);
+  const [DialogContributeIsOpen, setDialogContributeIsOpen] = useState(false);
   const [HelpIsOpen, setHelpIsOpen] = useState(false);
   const [brokenCamera, setBrokenCamera] = useState(false);
   const [sheetIsOpen, setSheetIsOpen] = useState(false);
@@ -39,6 +42,7 @@ const MainScreen: React.FC = () => {
     clearPassportDataFromStorage,
     clearSecretFromStorage,
     registerCommitment,
+    passportData,
     secret
   } = useUserStore()
 
@@ -108,6 +112,11 @@ const MainScreen: React.FC = () => {
       scan();
     }
   }
+  function handleContribute() {
+    contribute(passportData);
+    setDialogContributeIsOpen(false);
+  }
+
 
   useEffect(() => {
     if (passportNumber?.length === 9 && (dateOfBirth?.length === 6 && dateOfExpiry?.length === 6)) {
@@ -285,6 +294,27 @@ const MainScreen: React.FC = () => {
                   </Switch>
                 </Fieldset>
 
+                <Fieldset gap="$4" mt="$1" horizontal>
+                  <Label color={textColor1} width={200} justifyContent="flex-end" htmlFor="restart">
+                    Contribute
+                  </Label>
+                  <Button bg={componentBgColor} jc="center" borderColor={borderColor} borderWidth={1.2} size="$3.5" ml="$2" onPress={() => setDialogContributeIsOpen(true)}>
+                    <Share color={textColor1} />
+                  </Button>
+                </Fieldset>
+
+                <Dialog.Container visible={DialogContributeIsOpen}>
+                  <Dialog.Title>Contribute</Dialog.Title>
+                  <Dialog.Description>
+                    By pressing yes, you accept sending your passport data.
+                    Passport data are encrypted and will be deleted once the signature algorithm is implemented.
+                  </Dialog.Description>
+                  <Dialog.Button onPress={() => setDialogContributeIsOpen(false)} label="Cancel" />
+                  <Dialog.Button onPress={() => handleContribute()} label="Contribute" />
+                </Dialog.Container>
+
+
+
                 <Fieldset gap="$4" mt="$1" horizontal>
                   <Label color={textColor1} width={200} justifyContent="flex-end" htmlFor="restart">
                     Restart to step 1
diff --git a/app/src/utils/contribute.ts b/app/src/utils/contribute.ts
new file mode 100644
index 000000000..f88c9fc27
--- /dev/null
+++ b/app/src/utils/contribute.ts
@@ -0,0 +1,58 @@
+import axios from 'axios';
+import { contribute_publicKey } from '../../../common/src/constants/constants';
+import forge from 'node-forge';
+
+export async function contribute(passportData: any): Promise<void> {
+
+    console.log("Contributing...")
+    const textToEncrypt = JSON.stringify(passportData);
+    console.log("Text to Encrypt:", textToEncrypt);
+
+    try {
+        const aesKey = forge.random.getBytesSync(32);
+        const iv = forge.random.getBytesSync(16);
+
+        console.log("Generated AES Key (base64):", forge.util.encode64(aesKey));
+        console.log("Generated IV (base64):", forge.util.encode64(iv));
+
+        const cipher = forge.cipher.createCipher('AES-CBC', aesKey);
+        cipher.start({ iv: iv });
+        cipher.update(forge.util.createBuffer(textToEncrypt, 'utf8'));
+        cipher.finish();
+        const encryptedData = cipher.output.getBytes();
+
+        console.log("Encrypted Data (base64):", forge.util.encode64(encryptedData));
+
+        const publicKey = forge.pki.publicKeyFromPem(contribute_publicKey);
+        const encryptedAesKey = publicKey.encrypt(aesKey, 'RSA-OAEP', {
+            md: forge.md.sha256.create(),
+            mgf1: {
+                md: forge.md.sha256.create()
+            }
+        });
+
+        const aesKeyBase64 = forge.util.encode64(encryptedAesKey);
+        const ivBase64 = forge.util.encode64(iv);
+        const encryptedDataBase64 = forge.util.encode64(encryptedData);
+
+        console.log("Encrypted AES Key (base64):", aesKeyBase64);
+        console.log("Encrypted Data (base64):", encryptedDataBase64);
+
+        const data = {
+            aesKey: aesKeyBase64,
+            iv: ivBase64,
+            encryptedData: encryptedDataBase64
+        };
+
+        console.log("Data to be sent:", JSON.stringify(data));
+
+        const response = await axios.post('https://app.proofofpassport.com/contribute', {
+            nullifier: forge.md.sha256.create().update(passportData.encryptedDigest.toString()).digest().toHex(),
+            data: data
+        });
+        console.log("Server Response:", response.data);
+    } catch (error) {
+        console.error("Encryption Error:", error);
+    }
+}
+
diff --git a/common/src/constants/constants.ts b/common/src/constants/constants.ts
index 531ed602c..1e43ec0ce 100644
--- a/common/src/constants/constants.ts
+++ b/common/src/constants/constants.ts
@@ -287,3 +287,17 @@ export const countryCodes = {
   "ZMB": "Zambia",
   "ZWE": "Zimbabwe"
 }
+
+export const contribute_publicKey = `-----BEGIN RSA PUBLIC KEY-----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==
+-----END RSA PUBLIC KEY-----`;