added login cookie, added change pwd screen

test.py

@@ -0,0 +1,59 @@
+import pickle
+from cryptography.fernet import Fernet
+
+# =====================================================
+# SECRET KEY (only your program has this)
+# =====================================================
+# Generate once using: Fernet.generate_key()
+_SECRET_KEY = b'YFK7QCyTzhyLO4vqrnRxvDAI5uu8mXEYrInEjbRoQgs='
+
+fernet = Fernet(_SECRET_KEY)
+
+# =====================================================
+# ENCRYPT
+# =====================================================
+def encrypt_object(obj) -> bytes:
+    """
+    Encrypt any Python object and return encrypted bytes.
+    """
+    serialized = pickle.dumps(obj)
+    encrypted = fernet.encrypt(serialized)
+    return encrypted
+
+# =====================================================
+# DECRYPT
+# =====================================================
+def decrypt_object(encrypted_data: bytes):
+    """
+    Decrypt bytes back into the original Python object.
+    """
+    decrypted = fernet.decrypt(encrypted_data)
+    obj = pickle.loads(decrypted)
+    return obj
+
+# =====================================================
+# EXAMPLE USAGE
+# =====================================================
+if __name__ == "__main__":
+    original_object = {
+        "user": "alice",
+        "permissions": ["read", "write"],
+        "balance": 123.45
+    }
+
+    encrypted = encrypt_object(original_object)
+    print("Encrypted:", str(encrypted))
+
+    decrypted = decrypt_object(encrypted)
+    print("Decrypted:", decrypted)
+
+
+bytes_data = b'I am a bytes string'
+
+string_data = bytes_data.decode('utf-8')
+
+print("Type Before :- ",type(bytes_data))
+
+print(string_data)
+
+print("Type After :- ",type(string_data))