The initialization vector must be transmitted to the receiver for proper decryption, but it need not be kept secret. This initialization vector is generated with every encryption, and its purpose is to produce different encrypted data so that an attacker cannot use cryptanalysis to infer key data or message data.Ī 16-byte initialization vector is required which is generated as follows. In addition to the key, AES also needs an initialization vector. key = ''.join(chr(random.randint(0, 0xFF)) for i in range(16)) Do not copy and use this key generation scheme in production code.ĪES encryption needs a 16-byte key. That being said, for the sake of demonstration of AES encryption, we generate a random key using a rather simple scheme. By strong, we mean not easily guessed and has sufficient entropy (or secure randomness). This is probably the weakest link in the chain. The stronger the key, the stronger your encryption. Generating a KeyĪES encryption needs a strong key. In this article, we investigate using pycrypto’s implementation of AES for file encryption and decryption. That being said, pycrypto is a pretty good module covering many aspects of cryptography. In our experience JCE is more extensive and complete, and the documentation for JCE is also more complete. Pycrypto is somewhat similar to JCE (Java Cryptography Extension) for Java. Pycrypto is a python module that provides cryptographic services.
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