python_cryptography.py

# pip install cryptography
from cryptography.fernet import Fernet


class LockBoxServer:
    def __init__(self):
        session_key = Fernet.generate_key()
        print(f"{session_key=}")
        self.fernet = Fernet(session_key)

    def encrypt(self, data: bytes) -> str:
        return self.fernet.encrypt(data)

    def decrypt(self, token: str) -> bytes:
        return self.fernet.decrypt(token)


server = LockBoxServer()
encrypt_token = server.encrypt("данные".encode())
print(f"{encrypt_token=}")
decrypt_result = server.decrypt(encrypt_token).decode()
print(f"{decrypt_result=}")