Create privacy_enhancement.py

src/privacy/privacy_enhancement.py

@@ -0,0 +1,90 @@
+from Crypto.PublicKey import RSA
+from Crypto.Cipher import PKCS1_OAEP
+from Crypto.Random import get_random_bytes
+import json
+import os
+
+class PrivacyEnhancement:
+    def __init__(self, key_storage_file='user_keys.json'):
+        self.key_storage_file = key_storage_file
+        self.user_keys = {}
+        self.load_keys()
+
+    def load_keys(self):
+        """Load user keys from a JSON file."""
+        if os.path.exists(self.key_storage_file):
+            with open(self.key_storage_file, 'r') as file:
+                self.user_keys = json.load(file)
+
+    def save_keys(self):
+        """Save user keys to a JSON file."""
+        with open(self.key_storage_file, 'w') as file:
+            json.dump(self.user_keys, file)
+
+    def generate_keys(self, user_id):
+        """Generate a new RSA key pair for a user."""
+        key = RSA.generate(2048)
+        private_key = key.export_key()
+        public_key = key.publickey().export_key()
+
+        self.user_keys[user_id] = {
+            'private_key': private_key.decode('utf-8'),
+            'public_key': public_key.decode('utf-8')
+        }
+        self.save_keys()
+        return public_key.decode('utf-8')
+
+    def encrypt_data(self, user_id, data):
+        """Encrypt data using the user's public key."""
+        if user_id not in self.user_keys:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        public_key = RSA.import_key(self.user_keys[user_id]['public_key'])
+        cipher = PKCS1_OAEP.new(public_key)
+        encrypted_data = cipher.encrypt(data.encode('utf-8'))
+        return encrypted_data
+
+    def decrypt_data(self, user_id, encrypted_data):
+        """Decrypt data using the user's private key."""
+        if user_id not in self.user_keys:
+            raise ValueError("User  keys not found. Please generate keys first.")
+
+        private_key = RSA.import_key(self.user_keys[user_id]['private_key'])
+        cipher = PKCS1_OAEP.new(private_key)
+        decrypted_data = cipher.decrypt(encrypted_data)
+        return decrypted_data.decode('utf-8')
+
+    def create_zero_knowledge_proof(self, secret):
+        """Create a simple zero-knowledge proof for a secret."""
+        # In a real implementation, this would be a more complex ZKP
+        proof = f"Proof of {secret}"
+        return proof
+
+    def verify_zero_knowledge_proof(self, proof, secret):
+        """Verify the zero-knowledge proof."""
+        return proof == f"Proof of {secret}"
+
+# Example usage
+if __name__ == "__main__":
+    privacy = PrivacyEnhancement()
+
+    # Generate keys for a user
+    user_id = "user123"
+    public_key = privacy.generate_keys(user_id)
+    print(f"Generated public key for {user_id}: {public_key}")
+
+    # Encrypt and decrypt data
+    secret_data = "This is a secret message."
+    encrypted_data = privacy.encrypt_data(user_id, secret_data)
+    print(f"Encrypted data: {encrypted_data}")
+
+    decrypted_data = privacy.decrypt_data(user_id, encrypted_data)
+    print(f"Decrypted data: {decrypted_data}")
+
+    # Create and verify a zero-knowledge proof
+    secret = "my_secret"
+    proof = privacy.create_zero_knowledge_proof(secret)
+    print(f"Generated proof: {proof}")
+
+    is_valid = privacy.verify_zero_knowledge_proof(proof, secret)
+    print(f"Is the proof valid? {is_valid}")