diff --git a/src/collection.py b/src/collection.py
index 603163f..130ae74 100644
--- a/src/collection.py
+++ b/src/collection.py
@@ -1,8 +1,8 @@
 from pathlib import Path
-from os import walk, chmod
+from os import chmod
 from Crypto.PublicKey import RSA
 
-class ssh_key:
+class SshKey:
     """
     Object class for a ssh key
     """
@@ -38,25 +38,23 @@ class Collection:
         public class to generate a ssh key
         """
         key = RSA.generate(2048)
-        sshKey = ssh_key(name=name, key_type=key_type, private=key.exportKey('PEM'), public=key.publickey().exportKey('OpenSSH'))
-        self.save_ssh_key(sshKey=sshKey)
+        my_ssh_key = SshKey(name=name, key_type=key_type, private=key.exportKey('PEM'), public=key.publickey().exportKey('OpenSSH'))
+        self.save_ssh_key(my_ssh_key=my_ssh_key)
 
-    def save_ssh_key(self, sshKey: ssh_key):
+    def save_ssh_key(self, my_ssh_key: SshKey):
         """
-        Function to save the sshkey
+        Function to save the ssh key
         """
-        key_file_path = self.collection_path.joinpath(sshKey.get_name())
+        key_file_path = self.collection_path.joinpath(my_ssh_key.get_name())
+        ## Info File
         with open(f"{key_file_path}.txt", "w+", encoding="utf-8") as info_file:
-            info_file.write(f"name: {sshKey.get_name()}\nKey_type: {sshKey.get_type()}")
+            info_file.write(f"name: {my_ssh_key.get_name()}\nKey_type: {my_ssh_key.get_type()}")
+
+        ## Private Key
         with open(key_file_path, "wb") as private_file:
-            private_file.write(sshKey.get_private())
+            private_file.write(my_ssh_key.get_private())
+            chmod(key_file_path, 0o600)
+
+        ## Public Key
         with open(f"{key_file_path}.pub", "wb") as public_file:
-            public_file.write(sshKey.get_public())
-
-        
-        
-        
-
-
-
-
+            public_file.write(my_ssh_key.get_public())
diff --git a/src/encryptor.py b/src/encryptor.py
new file mode 100644
index 0000000..eb27ca5
--- /dev/null
+++ b/src/encryptor.py
@@ -0,0 +1,57 @@
+import base64
+import os
+from Crypto.Cipher import AES
+from Crypto.Protocol.KDF import PBKDF2
+from Crypto.Random import get_random_bytes
+
+class Encryptor:
+    def __init__(self, password: str):
+        self.password = password.encode()
+        self.salt_size = 16
+        self.iv_size = 16
+        self.key_size = 32
+        self.iterations = 100_000
+
+    def _derive_key(self, salt: bytes) -> bytes:
+        """
+        Dérive une clé à partir du mot de passe et du sel.
+        """
+        return PBKDF2(self.password, salt, dkLen=self.key_size, count=self.iterations)
+
+    def encrypt(self, plaintext: str) -> str:
+        """
+        Encrypte une chaîne de texte en base64.
+        """
+        salt = get_random_bytes(self.salt_size)
+        key = self._derive_key(salt)
+        iv = get_random_bytes(self.iv_size)
+
+        # Padding (PKCS7)
+        pad_len = AES.block_size - (len(plaintext.encode()) % AES.block_size)
+        padded = plaintext + chr(pad_len) * pad_len
+
+        cipher = AES.new(key, AES.MODE_CBC, iv)
+        ciphertext = cipher.encrypt(padded.encode())
+
+        # Encodage final : salt + iv + ciphertext
+        encrypted_data = base64.b64encode(salt + iv + ciphertext).decode()
+        return encrypted_data
+
+    def decrypt(self, encrypted_text: str) -> str:
+        """
+        Décrypte une chaîne encodée en base64.
+        """
+        data = base64.b64decode(encrypted_text)
+        salt = data[:self.salt_size]
+        iv = data[self.salt_size:self.salt_size + self.iv_size]
+        ciphertext = data[self.salt_size + self.iv_size:]
+
+        key = self._derive_key(salt)
+        cipher = AES.new(key, AES.MODE_CBC, iv)
+        padded_plaintext = cipher.decrypt(ciphertext)
+
+        # Retrait du padding
+        pad_len = padded_plaintext[-1]
+        plaintext = padded_plaintext[:-pad_len].decode()
+
+        return plaintext