AES encryption with Python

First download, build and install the Python Cryptography Toolkit. Next:

>>> from Crypto.Cipher import AES >>> passphrase = 'somephrase' >>> aes = AES.new(passphrase, AES.MODE_CFB) Traceback (most recent call last): File "<stdin>", line 1, in ? ValueError: AES key must be either 16, 24, or 32 bytes long >>> passphrase = '1234567890123456' >>> aes = AES.new(passphrase, AES.MODE_CFB) >>> plaintext = 'Hello Bob. Please save me!' >>> ciphertext = aes.encrypt(plaintext) >>> print ciphertext \uffff\uffff\ufffflx\uffff\uffff\uffff\uffff^\uffff\uffff@\uffff\uffffR\uffff\uffffi\uffff >>> aes = AES.new(passphrase, AES.MODE_CFB) >>> print aes.decrypt(ciphertext) Hello Bob. Please save me!