diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cc7a70a..2c261b6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,9 +22,17 @@ jobs:
       uses: actions/setup-node@v2
       with:
         node-version: 20.x
+    
+    - name: Set up Python 3
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.11'
 
     - name: Install dependencies
       run: node ci --function installDeps
+    
+    - name: install python libs
+      run: node ci --function installPythonLibs --params "{\"libs\":[\"crypto-py\"]}"
 
     - name: Run linter
       run: node ci --function lint
diff --git a/.gitignore b/.gitignore
index 16324e9..b446751 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,4 +18,7 @@ node_modules
 report
 
 #ignition files
-/ignition/deployments
\ No newline at end of file
+/ignition/deployments
+
+# external libs linked by symlinks
+crypto-py
\ No newline at end of file
diff --git a/README.md b/README.md
index e57b3dc..247185b 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ Agora is a web3 dApp based on the [Hardhat framework](https://hardhat.org/) and
 In order to run the application you need the following software installed on you machine:
 
 * [Node.js](https://nodejs.org/en) v20.11.1 or above
+* [Python](https://www.python.org/) v3.11.2 or above
 
 You also need an Alchemy account.
 
@@ -39,6 +40,18 @@ To setup the application follow these steps:
     * `REPORT_GAS` enable or disable the gas report on smart contracts unit tests executions;
     * `NODE_ENV` set `development` for your local machine;
 
+### Install crypto-py
+
+Agora uses a Python external library for cryptographic operations called [crypto-py](https://github.com/nova-collective/crypto-py). This library needs to be
+manually integrated into the Hardhat framework, follow this steps:
+
+5. from the root folder of application, go to the `lib` folder;
+6. clone `crypto-py` inside the lib folder;
+6. go inside the crypto-py folder and install the dependencies `pip install -r requirements.txt`;
+7. if you decide to set a python environment inside the crypto-py folder, remember to activate the environment;
+
+Alternatively, If you are in a Unix environment, you can clone the library somewhere else and create a symbolic link inside the Agora lib folder.
+
 ## How to commit
 
 The `main` and the `develop` branches are protected. It is required to open and review pull requests in order to merge the code.
@@ -66,7 +79,7 @@ Smart contracts code coverage documentation [here](https://www.npmjs.com/package
 
 | step | library used | theshold | is error blocking |
 |------|--------------|----------|-------------------|
-| Code Linting | [eslint](https://www.npmjs.com/package/eslint) | No thesholds | yes |
+| Code Linting | [eslint](https://www.npmjs.com/package/eslint) | Not applicable | yes |
 | Code duplication | [jscpd](https://www.npmjs.com/package/jscpd) | 10% | yes |
 | Smart contracts unit tests | [jest](https://www.npmjs.com/package/jest) | all tests must pass | yes |
 | TypeScript files unit tests | [jest](https://www.npmjs.com/package/jest) | all tests must pass; 80% code coverage | yes |
diff --git a/ci/config.js b/ci/config.js
new file mode 100644
index 0000000..bea892d
--- /dev/null
+++ b/ci/config.js
@@ -0,0 +1,7 @@
+const config = {
+  installPythonLibs: {
+    cryptoPyRepo: "https://github.com/nova-collective/crypto-py",
+  },
+};
+
+module.exports = config;
diff --git a/ci/functions.js b/ci/functions.js
index d152e4e..cb80bd4 100644
--- a/ci/functions.js
+++ b/ci/functions.js
@@ -1,6 +1,8 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
 const execSync = require("child_process").execSync;
 const fs = require("fs");
+const path = require("path");
+const config = require("./config");
 
 const execSyncOptions = { stdio: "inherit" };
 
@@ -68,6 +70,25 @@ const functions = {
       process.exit(1);
     }
   },
+  installPythonLibs: function ({ libs }) {
+    console.log(libs);
+
+    try {
+      if (libs.includes("crypto-py")) {
+        const libPath = path.resolve("lib");
+        const repo = config.installPythonLibs.cryptoPyRepo;
+
+        execSync(`cd ${libPath} && git clone ${repo}`, execSyncOptions);
+        execSync(
+          `cd ${libPath}/crypto-py && pip install -r requirements.txt`,
+          execSyncOptions,
+        );
+      }
+    } catch (e) {
+      console.log(e);
+      process.exit(1);
+    }
+  },
 };
 
 module.exports = functions;
diff --git a/contracts/DEC.sol b/contracts/DEC.sol
index e0a5719..cce90c4 100644
--- a/contracts/DEC.sol
+++ b/contracts/DEC.sol
@@ -12,10 +12,8 @@ contract DEC {
     Encrypted country;
 
     struct Encrypted {
-        string iv;
-        string ephemPublicKey;
-        string ciphertext;
-        string mac;
+        string chiper;
+        string nonce;
     }
 
     constructor(
diff --git a/election-scripts/create-dec.ts b/election-scripts/create-dec.ts
index 1c06107..73dfe62 100644
--- a/election-scripts/create-dec.ts
+++ b/election-scripts/create-dec.ts
@@ -13,7 +13,7 @@ import { ethers } from "hardhat";
 import { DEC, Response, result, CreateDECResponse } from "./types";
 import { DECMock, VoterEOA } from "./__mocks__";
 import { encryptString } from "../lib";
-import { Encrypted } from "eth-crypto";
+import { Encrypted } from "../lib/types";
 
 /**
  * This function encrypt the Voter's DECs data and deploys the smart contract instance.
@@ -35,10 +35,10 @@ export async function main(
     const dec = decsData || DECMock;
     const key = privateKey || VoterEOA.privateKey;
 
-    const eTaxCode: Encrypted = await encryptString(dec.taxCode, key);
-    const eMunicipality: Encrypted = await encryptString(dec.municipality, key);
-    const eRegion: Encrypted = await encryptString(dec.region, key);
-    const eCountry: Encrypted = await encryptString(dec.country, key);
+    const eTaxCode: Encrypted = encryptString(dec.taxCode, key);
+    const eMunicipality: Encrypted = encryptString(dec.municipality, key);
+    const eRegion: Encrypted = encryptString(dec.region, key);
+    const eCountry: Encrypted = encryptString(dec.country, key);
 
     const contract = await ContractFactory.deploy(
       eTaxCode,
diff --git a/lib/crypto-utils.test.ts b/lib/crypto-utils.test.ts
index bbb2d7c..b6ff178 100644
--- a/lib/crypto-utils.test.ts
+++ b/lib/crypto-utils.test.ts
@@ -4,21 +4,30 @@ import { mockEOAs } from "./__mocks__";
 describe("Crypto Utils", () => {
   const privateKey = mockEOAs[0].privateKey;
 
-  it("should encrypt and decrypt a string", async () => {
+  it("should encrypt and decrypt a string", () => {
     const originalString = "Hello, world!";
-    const encryptedString = await encryptString(originalString, privateKey);
+    const encryptedString = encryptString(originalString, privateKey);
 
-    const decryptedString = await decryptString(encryptedString, privateKey);
-    expect(decryptedString).toEqual(originalString);
+    const decryptedString = decryptString(
+      encryptedString.chiper,
+      privateKey,
+      encryptedString.nonce,
+    );
+    expect(decryptedString.message).toEqual(originalString);
   });
 
   it("should handle decryption with incorrect private key", async () => {
     const originalString = "Hello, world!";
-    const encryptedString = await encryptString(originalString, privateKey);
+    const encryptedString = encryptString(originalString, privateKey);
     const incorrectPrivateKey = "incorrectPrivateKey";
-
-    await expect(
-      decryptString(encryptedString, incorrectPrivateKey),
-    ).rejects.toThrow("Error decrypting string");
+    try {
+      decryptString(
+        encryptedString.chiper,
+        incorrectPrivateKey,
+        encryptedString.nonce,
+      );
+    } catch (e: any) {
+      expect(e.message).toBe("Error decrypting string");
+    }
   });
 });
diff --git a/lib/crypto-utils.ts b/lib/crypto-utils.ts
index fbfced0..92c7168 100644
--- a/lib/crypto-utils.ts
+++ b/lib/crypto-utils.ts
@@ -6,8 +6,9 @@
  * is because If we send the data and then encrypt it in solidity, the data will be visible in the transaction that
  * in the first place was used to send the data to the contract. Also, solidity doesn't have a function to encrypt.
  */
-import * as EthCrypto from "eth-crypto";
-import { Encrypted } from "eth-crypto";
+import { Encrypted, Decrypted } from "./types";
+import { execSync, ExecSyncOptionsWithStringEncoding } from "child_process";
+import * as path from "path";
 
 /**
  * This function encrypt a string by using a private key possibly from an EOA (Voter's account).
@@ -16,20 +17,36 @@ import { Encrypted } from "eth-crypto";
  *
  * @param {string} decryptedString - the string to be encrypted
  * @param {string} privateKey - a private key, e.g. from the EOA
- * @returns {Promise<Encrypted>} - the encrypted output string
+ * @returns {Encrypted} - the encrypted output string
  */
-export async function encryptString(
+export function encryptString(
   decryptedString: string,
   privateKey: string,
-): Promise<Encrypted> {
+): Encrypted {
   try {
-    const publicKey = await EthCrypto.publicKeyByPrivateKey(privateKey);
+    const execSyncOptions = {
+      stdio: "pipe",
+    } as ExecSyncOptionsWithStringEncoding;
 
-    const encrypted = await EthCrypto.encryptWithPublicKey(
-      publicKey,
-      decryptedString,
+    if (privateKey.startsWith("0x")) {
+      privateKey = privateKey.substring(2);
+    }
+
+    const cryptoPyPath = getCryptoPyPath();
+
+    const encrypted = execSync(
+      `cd ${cryptoPyPath} && python3 Crypto.py AESGCM_encrypt --key="${privateKey}" --secret="${decryptedString}"`,
+      execSyncOptions,
     );
-    return encrypted;
+
+    const en = encrypted.toString().split("\n");
+    const chiper = en[0].split(" ")[1];
+    const nonce = en[1].split("  ")[1];
+
+    return {
+      chiper,
+      nonce,
+    };
   } catch (e) {
     console.error(e);
     throw new Error("Error encrypting string");
@@ -41,20 +58,48 @@ export async function encryptString(
  *
  * @param {Encrypted} encryptedString - the secret to decrypt
  * @param {string}  privateKey - A private key possibly from an EOA
- * @returns {Promise<string>} - the string decrypted
+ * @param {string}  nonce - The nonce value used for the encryption
+ * @returns {Decrypted} - the string decrypted
  */
-export async function decryptString(
-  encryptedString: Encrypted,
+export function decryptString(
+  encryptedString: string,
   privateKey: string,
-): Promise<string> {
+  nonce: string,
+): Decrypted {
   try {
-    const decrypted = await EthCrypto.decryptWithPrivateKey(
-      privateKey,
-      encryptedString,
+    const execSyncOptions = {
+      stdio: "pipe",
+    } as ExecSyncOptionsWithStringEncoding;
+
+    if (privateKey.startsWith("0x")) {
+      privateKey = privateKey.substring(2);
+    }
+
+    const cryptoPyPath = getCryptoPyPath();
+    const decrypted = execSync(
+      `cd ${cryptoPyPath} && python3 Crypto.py AESGCM_decrypt --key=${privateKey} --nonce=${nonce} --chiper=${encryptedString}`,
+      execSyncOptions,
+    );
+
+    const de = decrypted.toString().split("\n");
+    const message = de[0].substring(
+      de[0].indexOf("message: ") + "message: ".length,
     );
-    return decrypted;
+
+    return { message };
   } catch (e) {
-    console.error(e);
     throw new Error("Error decrypting string");
   }
 }
+
+/**
+ * The crypto-py library should be manually copy-pasted (or git cloned) inside the lib folder.
+ * Linux and MacOS users can in alternative create a symbolic link.
+ * After that, activate the python venv in the crypto-py folder, e.g. for linux: source venv/bin/activate
+ *
+ * @returns {string} - the absolute path of the crypto-py library
+ */
+function getCryptoPyPath() {
+  const cryptoRelativePath = path.join("lib", "crypto-py");
+  return path.resolve(cryptoRelativePath);
+}
diff --git a/lib/types.ts b/lib/types.ts
new file mode 100644
index 0000000..44daf8c
--- /dev/null
+++ b/lib/types.ts
@@ -0,0 +1,8 @@
+export type Encrypted = {
+  chiper: string;
+  nonce: string;
+};
+
+export type Decrypted = {
+  message: string;
+};
diff --git a/package-lock.json b/package-lock.json
index aaebcb0..605ed0d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,15 @@
 {
   "name": "agora",
-  "version": "0.4.0",
+  "version": "0.8.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "agora",
-      "version": "0.4.0",
+      "version": "0.8.0",
       "license": "GPL-3.0",
       "dependencies": {
-        "dotenv": "^16.4.5",
-        "eth-crypto": "^2.6.0"
+        "dotenv": "^16.4.5"
       },
       "devDependencies": {
         "@commitlint/cli": "^19.2.1",
@@ -555,17 +554,6 @@
         "@babel/core": "^7.0.0-0"
       }
     },
-    "node_modules/@babel/runtime": {
-      "version": "7.20.13",
-      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.20.13.tgz",
-      "integrity": "sha512-gt3PKXs0DBoL9xCvOIIZ2NEqAGZqHjAnmVbfQtB620V0uReIQutpel14KcneZuer7UioY8ALKZ7iocavvzTNFA==",
-      "dependencies": {
-        "regenerator-runtime": "^0.13.11"
-      },
-      "engines": {
-        "node": ">=6.9.0"
-      }
-    },
     "node_modules/@babel/template": {
       "version": "7.24.0",
       "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.24.0.tgz",
@@ -1472,52 +1460,6 @@
         "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
       }
     },
-    "node_modules/@ethereumjs/common": {
-      "version": "2.6.5",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.6.5.tgz",
-      "integrity": "sha512-lRyVQOeCDaIVtgfbowla32pzeDv2Obr8oR8Put5RdUBNRGr1VGPGQNGP6elWIpgK3YdpzqTOh4GyUGOureVeeA==",
-      "dependencies": {
-        "crc-32": "^1.2.0",
-        "ethereumjs-util": "^7.1.5"
-      }
-    },
-    "node_modules/@ethereumjs/common/node_modules/ethereum-cryptography": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz",
-      "integrity": "sha512-w8/4x1SGGzc+tO97TASLja6SLd3fRIK2tLVcV2Gx4IB21hE19atll5Cq9o3d0ZmAYC/8aw0ipieTSiekAea4SQ==",
-      "dependencies": {
-        "@types/pbkdf2": "^3.0.0",
-        "@types/secp256k1": "^4.0.1",
-        "blakejs": "^1.1.0",
-        "browserify-aes": "^1.2.0",
-        "bs58check": "^2.1.2",
-        "create-hash": "^1.2.0",
-        "create-hmac": "^1.1.7",
-        "hash.js": "^1.1.7",
-        "keccak": "^3.0.0",
-        "pbkdf2": "^3.0.17",
-        "randombytes": "^2.1.0",
-        "safe-buffer": "^5.1.2",
-        "scrypt-js": "^3.0.0",
-        "secp256k1": "^4.0.1",
-        "setimmediate": "^1.0.5"
-      }
-    },
-    "node_modules/@ethereumjs/common/node_modules/ethereumjs-util": {
-      "version": "7.1.5",
-      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
-      "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
-      "dependencies": {
-        "@types/bn.js": "^5.1.0",
-        "bn.js": "^5.1.2",
-        "create-hash": "^1.1.2",
-        "ethereum-cryptography": "^0.1.3",
-        "rlp": "^2.2.4"
-      },
-      "engines": {
-        "node": ">=10.0.0"
-      }
-    },
     "node_modules/@ethereumjs/rlp": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/@ethereumjs/rlp/-/rlp-4.0.1.tgz",
@@ -1530,52 +1472,6 @@
         "node": ">=14"
       }
     },
-    "node_modules/@ethereumjs/tx": {
-      "version": "3.5.2",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.5.2.tgz",
-      "integrity": "sha512-gQDNJWKrSDGu2w7w0PzVXVBNMzb7wwdDOmOqczmhNjqFxFuIbhVJDwiGEnxFNC2/b8ifcZzY7MLcluizohRzNw==",
-      "dependencies": {
-        "@ethereumjs/common": "^2.6.4",
-        "ethereumjs-util": "^7.1.5"
-      }
-    },
-    "node_modules/@ethereumjs/tx/node_modules/ethereum-cryptography": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/ethereum-cryptography/-/ethereum-cryptography-0.1.3.tgz",
-      "integrity": "sha512-w8/4x1SGGzc+tO97TASLja6SLd3fRIK2tLVcV2Gx4IB21hE19atll5Cq9o3d0ZmAYC/8aw0ipieTSiekAea4SQ==",
-      "dependencies": {
-        "@types/pbkdf2": "^3.0.0",
-        "@types/secp256k1": "^4.0.1",
-        "blakejs": "^1.1.0",
-        "browserify-aes": "^1.2.0",
-        "bs58check": "^2.1.2",
-        "create-hash": "^1.2.0",
-        "create-hmac": "^1.1.7",
-        "hash.js": "^1.1.7",
-        "keccak": "^3.0.0",
-        "pbkdf2": "^3.0.17",
-        "randombytes": "^2.1.0",
-        "safe-buffer": "^5.1.2",
-        "scrypt-js": "^3.0.0",
-        "secp256k1": "^4.0.1",
-        "setimmediate": "^1.0.5"
-      }
-    },
-    "node_modules/@ethereumjs/tx/node_modules/ethereumjs-util": {
-      "version": "7.1.5",
-      "resolved": "https://registry.npmjs.org/ethereumjs-util/-/ethereumjs-util-7.1.5.tgz",
-      "integrity": "sha512-SDl5kKrQAudFBUe5OJM9Ac6WmMyYmXX/6sTmLZ3ffG2eY6ZIGBes3pEDxNN6V72WyOw4CPD5RomKdsa8DAAwLg==",
-      "dependencies": {
-        "@types/bn.js": "^5.1.0",
-        "bn.js": "^5.1.2",
-        "create-hash": "^1.1.2",
-        "ethereum-cryptography": "^0.1.3",
-        "rlp": "^2.2.4"
-      },
-      "engines": {
-        "node": ">=10.0.0"
-      }
-    },
     "node_modules/@ethereumjs/util": {
       "version": "8.1.0",
       "resolved": "https://registry.npmjs.org/@ethereumjs/util/-/util-8.1.0.tgz",
@@ -1657,6 +1553,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abi/-/abi-5.7.0.tgz",
       "integrity": "sha512-351ktp42TiRcYB3H1OP8yajPeAQstMW/yCFokj/AthP9bLHzQFPlOrxOcwYEDkUAICmOHljvN4K39OMTMUa9RA==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1683,6 +1580,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abstract-provider/-/abstract-provider-5.7.0.tgz",
       "integrity": "sha512-R41c9UkchKCpAqStMYUpdunjo3pkEvZC3FAwZn5S5MGbXoMQOHIdHItezTETxAO5bevtMApSyEhn9+CHcDsWBw==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1707,6 +1605,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/abstract-signer/-/abstract-signer-5.7.0.tgz",
       "integrity": "sha512-a16V8bq1/Cz+TGCkE2OPMTOUDLS3grCpdjoJCYNnVBbdYEMSgKrU0+B90s8b6H+ByYTBZN7a3g76jdIJi7UfKQ==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1729,6 +1628,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/address/-/address-5.7.0.tgz",
       "integrity": "sha512-9wYhYt7aghVGo758POM5nqcOMaE168Q6aRLJZwUmiqSrAungkG74gSSeKEIR7ukixesdRZGPgVqme6vmxs1fkA==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1751,6 +1651,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/base64/-/base64-5.7.0.tgz",
       "integrity": "sha512-Dr8tcHt2mEbsZr/mwTPIQAf3Ai0Bks/7gTw9dSqk1mQvhW3XvRlmDJr/4n+wg1JmCl16NZue17CDh8xb/vZ0sQ==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1769,6 +1670,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/basex/-/basex-5.7.0.tgz",
       "integrity": "sha512-ywlh43GwZLv2Voc2gQVTKBoVQ1mti3d8HK5aMxsfu/nRDnMmNqaSJ3r3n85HBByT8OpoY96SXM1FogC533T4zw==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1788,6 +1690,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/bignumber/-/bignumber-5.7.0.tgz",
       "integrity": "sha512-n1CAdIHRWjSucQO3MC1zPSVgV/6dy/fjL9pMrPP9peL+QxEg9wOsVqwD4+818B6LUEtaXzVHQiuivzRoxPxUGw==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1808,6 +1711,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/bytes/-/bytes-5.7.0.tgz",
       "integrity": "sha512-nsbxwgFXWh9NyYWo+U8atvmMsSdKJprTcICAkvbBffT75qDocbuggBU0SJiVK2MuTrp0q+xvLkTnGMPK1+uA9A==",
+      "dev": true,
       "funding": [
         {
           "type": "individual",
@@ -1826,6 +1730,7 @@
       "version": "5.7.0",
       "resolved": "https://registry.npmjs.org/@ethersproject/constants/-/constants-5.7.0.tgz",
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       "integrity": "sha512-iuh7L6jA7JEGu2WxDwtQP1ddOpaJNC4KlDEFfdQajSGgGPNi4OyDc2R7QnbY2bR9QjBVGwgvTdNJZoE7RaxUMA==",
+      "dev": true,
       "dependencies": {
         "create-hash": "^1.1.2",
         "create-hmac": "^1.1.4",
@@ -14248,6 +13955,7 @@
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/randombytes/-/randombytes-2.1.0.tgz",
       "integrity": "sha512-vYl3iOX+4CKUWuxGi9Ukhie6fsqXqS9FE2Zaic4tNFD2N2QQaXOMFbuKK4QmDHC0JO6B1Zp41J0LpT0oR68amQ==",
+      "dev": true,
       "dependencies": {
         "safe-buffer": "^5.1.0"
       }
@@ -14277,6 +13985,7 @@
       "version": "3.6.2",
       "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.2.tgz",
       "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "dev": true,
       "dependencies": {
         "inherits": "^2.0.3",
         "string_decoder": "^1.1.1",
@@ -14332,11 +14041,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/regenerator-runtime": {
-      "version": "0.13.11",
-      "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.13.11.tgz",
-      "integrity": "sha512-kY1AZVr2Ra+t+piVaJ4gxaFaReZVH40AKNo7UCX6W+dEwBo/2oZJzqfuN1qLq1oL45o56cPaTXELwrTh8Fpggg=="
-    },
     "node_modules/repeat-string": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
@@ -14506,6 +14210,7 @@
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/ripemd160/-/ripemd160-2.0.2.tgz",
       "integrity": "sha512-ii4iagi25WusVoiC4B4lq7pbXfAp3D9v5CwfkY33vffw2+pkDjY1D8GaN7spsxvCSx8dkPqOZCEZyfxcmJG2IA==",
+      "dev": true,
       "dependencies": {
         "hash-base": "^3.0.0",
         "inherits": "^2.0.1"
@@ -14515,6 +14220,7 @@
       "version": "2.2.7",
       "resolved": "https://registry.npmjs.org/rlp/-/rlp-2.2.7.tgz",
       "integrity": "sha512-d5gdPmgQ0Z+AklL2NVXr/IoSjNZFfTVvQWzL/AM2AOcSzYP2xjlb0AC8YyCLc41MSNf6P6QVtjgPdmVtzb+4lQ==",
+      "dev": true,
       "dependencies": {
         "bn.js": "^5.2.0"
       },
@@ -14568,6 +14274,7 @@
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
       "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==",
+      "dev": true,
       "funding": [
         {
           "type": "github",
@@ -14695,12 +14402,14 @@
     "node_modules/scrypt-js": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/scrypt-js/-/scrypt-js-3.0.1.tgz",
-      "integrity": "sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA=="
+      "integrity": "sha512-cdwTTnqPu0Hyvf5in5asVdZocVDTNRmR7XEcJuIzMjJeSHybHl7vpB66AzwTaIg6CLSbtjcxc8fqcySfnTkccA==",
+      "dev": true
     },
     "node_modules/secp256k1": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/secp256k1/-/secp256k1-4.0.3.tgz",
       "integrity": "sha512-NLZVf+ROMxwtEj3Xa562qgv2BK5e2WNmXPiOdVIPLgs6lyTzMvBq0aWTYMI5XCP9jZMVKOcqZLw/Wc4vDkuxhA==",
+      "dev": true,
       "hasInstallScript": true,
       "dependencies": {
         "elliptic": "^6.5.4",
@@ -14755,7 +14464,8 @@
     "node_modules/setimmediate": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/setimmediate/-/setimmediate-1.0.5.tgz",
-      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA=="
+      "integrity": "sha512-MATJdZp8sLqDl/68LfQmbP8zKPLQNV6BIZoIgrscFDQ+RsvK/BxeDQOgyxKKoh0y/8h3BqVFnCqQ/gd+reiIXA==",
+      "dev": true
     },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
@@ -14767,6 +14477,7 @@
       "version": "2.4.11",
       "resolved": "https://registry.npmjs.org/sha.js/-/sha.js-2.4.11.tgz",
       "integrity": "sha512-QMEp5B7cftE7APOjk5Y6xgrbWu+WkLVQwk8JNjZ8nKRciZaByEW6MubieAiToS7+dwvrjGhH8jRXz3MVd0AYqQ==",
+      "dev": true,
       "dependencies": {
         "inherits": "^2.0.1",
         "safe-buffer": "^5.0.1"
@@ -15188,6 +14899,7 @@
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
       "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "dev": true,
       "dependencies": {
         "safe-buffer": "~5.2.0"
       }
@@ -16051,7 +15763,8 @@
     "node_modules/undici-types": {
       "version": "5.26.5",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
-      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA=="
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "dev": true
     },
     "node_modules/unicorn-magic": {
       "version": "0.1.0",
@@ -16126,6 +15839,7 @@
       "version": "5.0.10",
       "resolved": "https://registry.npmjs.org/utf-8-validate/-/utf-8-validate-5.0.10.tgz",
       "integrity": "sha512-Z6czzLq4u8fPOyx7TU6X3dvUZVvoJmxSQ+IcrlmagKhilxlhZgxPK6C5Jqbkw1IDUmFTM+cz9QDnnLTwDz/2gQ==",
+      "dev": true,
       "hasInstallScript": true,
       "optional": true,
       "peer": true,
@@ -16145,7 +15859,8 @@
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw=="
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "dev": true
     },
     "node_modules/uuid": {
       "version": "8.3.2",
diff --git a/package.json b/package.json
index 901b718..b914e9f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "agora",
-  "version": "0.8.0",
+  "version": "0.9.0",
   "description": "A confidentiality-first electronic voting system",
   "author": {
     "name": "nova collective",
@@ -22,10 +22,11 @@
     "coverage-contracts": "npx hardhat coverage",
     "deploy-contract": "./script/deploy",
     "duplicated": "npx jscpd",
+    "integrate-external-libs": "./script/lib-integration",
     "lint": "npx lint-staged",
+    "node:start": "npx hardhat node",
     "prepare": "husky prepare",
     "prepare-commit": "git-cz",
-    "node:start": "npx hardhat node",
     "test-contracts": "npx hardhat test",
     "test-scripts": " jest --coverage --bail --forceExit"
   },
@@ -53,8 +54,7 @@
     "npm": "~10.2.4"
   },
   "dependencies": {
-    "dotenv": "^16.4.5",
-    "eth-crypto": "^2.6.0"
+    "dotenv": "^16.4.5"
   },
   "devDependencies": {
     "@commitlint/cli": "^19.2.1",
diff --git a/script/lib-integration b/script/lib-integration
new file mode 100755
index 0000000..9d49ea4
--- /dev/null
+++ b/script/lib-integration
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+cd lib && ln -s ../../crypto-py crypto-py
\ No newline at end of file
diff --git a/test/DEC.ts b/test/DEC.ts
index 52d7f64..d81ea9f 100644
--- a/test/DEC.ts
+++ b/test/DEC.ts
@@ -2,26 +2,22 @@ import { assert } from "chai";
 import { ethers } from "hardhat";
 import { DEC } from "../typechain-types/DEC";
 import { encryptString, decryptString } from "../lib";
-import { Encrypted } from "eth-crypto";
+import { Encrypted } from "../lib/types";
 
 describe("DEC Contract", () => {
   let dec: DEC;
 
   const encryptedDataFactory = function (
-    iv: string,
-    ephemPublicKey: string,
-    ciphertext: string,
-    mac: string,
+    chiper: string,
+    nonce: string,
   ): Encrypted {
     return {
-      iv,
-      ephemPublicKey,
-      ciphertext,
-      mac,
+      chiper,
+      nonce,
     };
   };
 
-  const taxCode = "12345678901";
+  const taxCode = "CRVRMF12RFV4RTY7";
   const municipality = "Roma";
   const region = "Lazio";
   const country = "Italia";
@@ -34,10 +30,11 @@ describe("DEC Contract", () => {
   let eCountry: Encrypted;
 
   beforeEach(async () => {
-    eTaxCode = await encryptString(taxCode, PRIVATE_KEY);
-    eMunicipality = await encryptString(municipality, PRIVATE_KEY);
-    eRegion = await encryptString(region, PRIVATE_KEY);
-    eCountry = await encryptString(country, PRIVATE_KEY);
+    eTaxCode = encryptString(taxCode, PRIVATE_KEY);
+    eMunicipality = encryptString(municipality, PRIVATE_KEY);
+    eRegion = encryptString(region, PRIVATE_KEY);
+    eCountry = encryptString(country, PRIVATE_KEY);
+
     const DECFactory = await ethers.getContractFactory("DEC");
     dec = await DECFactory.deploy(eTaxCode, eMunicipality, eRegion, eCountry);
   });
@@ -56,43 +53,48 @@ describe("DEC Contract", () => {
     const enTaxCode = encryptedDataFactory(
       registeredTaxCode[0],
       registeredTaxCode[1],
-      registeredTaxCode[2],
-      registeredTaxCode[3],
     );
 
     const enMunicipality = encryptedDataFactory(
       registeredMunicipality[0],
       registeredMunicipality[1],
-      registeredMunicipality[2],
-      registeredMunicipality[3],
     );
 
     const enRegion = encryptedDataFactory(
       registeredRegion[0],
       registeredRegion[1],
-      registeredRegion[2],
-      registeredRegion[3],
     );
 
     const enCountry = encryptedDataFactory(
       registeredCountry[0],
       registeredCountry[1],
-      registeredCountry[2],
-      registeredCountry[3],
     );
 
-    const decodedTaxCode = await decryptString(enTaxCode, PRIVATE_KEY);
-    const decodedMunicipality = await decryptString(
-      enMunicipality,
+    const decodedTaxCode = decryptString(
+      enTaxCode.chiper,
+      PRIVATE_KEY,
+      enTaxCode.nonce,
+    );
+    const decodedMunicipality = decryptString(
+      enMunicipality.chiper,
+      PRIVATE_KEY,
+      enMunicipality.nonce,
+    );
+    const decodedRegion = decryptString(
+      enRegion.chiper,
       PRIVATE_KEY,
+      enRegion.nonce,
+    );
+    const decodedCountry = decryptString(
+      enCountry.chiper,
+      PRIVATE_KEY,
+      enCountry.nonce,
     );
-    const decodedRegion = await decryptString(enRegion, PRIVATE_KEY);
-    const decodedCountry = await decryptString(enCountry, PRIVATE_KEY);
 
-    assert.equal(decodedTaxCode, taxCode);
-    assert.equal(decodedMunicipality, municipality);
-    assert.equal(decodedRegion, region);
-    assert.equal(decodedCountry, country);
+    assert.equal(decodedTaxCode.message, taxCode);
+    assert.equal(decodedMunicipality.message, municipality);
+    assert.equal(decodedRegion.message, region);
+    assert.equal(decodedCountry.message, country);
   });
 
   it("Should set and get tax code correctly", async () => {
@@ -100,12 +102,7 @@ describe("DEC Contract", () => {
 
     const getTaxCode = await dec.getTaxCode();
 
-    const gTaxCode = encryptedDataFactory(
-      getTaxCode[0],
-      getTaxCode[1],
-      getTaxCode[2],
-      getTaxCode[3],
-    );
+    const gTaxCode = encryptedDataFactory(getTaxCode[0], getTaxCode[1]);
 
     assert.equal(JSON.stringify(eTaxCode), JSON.stringify(gTaxCode));
   });
@@ -118,8 +115,6 @@ describe("DEC Contract", () => {
     const gMunicipality = encryptedDataFactory(
       getMunicipality[0],
       getMunicipality[1],
-      getMunicipality[2],
-      getMunicipality[3],
     );
 
     assert.equal(JSON.stringify(eMunicipality), JSON.stringify(gMunicipality));
@@ -130,12 +125,7 @@ describe("DEC Contract", () => {
 
     const getRegion = await dec.getRegion();
 
-    const gRegion = encryptedDataFactory(
-      getRegion[0],
-      getRegion[1],
-      getRegion[2],
-      getRegion[3],
-    );
+    const gRegion = encryptedDataFactory(getRegion[0], getRegion[1]);
 
     assert.equal(JSON.stringify(eRegion), JSON.stringify(gRegion));
   });
@@ -145,12 +135,7 @@ describe("DEC Contract", () => {
 
     const getCountry = await dec.getCountry();
 
-    const gCountry = encryptedDataFactory(
-      getCountry[0],
-      getCountry[1],
-      getCountry[2],
-      getCountry[3],
-    );
+    const gCountry = encryptedDataFactory(getCountry[0], getCountry[1]);
 
     assert.equal(JSON.stringify(eCountry), JSON.stringify(gCountry));
   });