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Keyczar is an open source cryptographic toolkit designed to make it easier and safer for devlopers to use cryptography in their applications. Keyczar supports authentication and encryption with both symmetric and asymmetric keys. Some features of Keyczar include: A simple API Key rotation and versioning Safe default algorithms, modes, and key lengths Automated generation of initialization vectors and ciphertext signatures Java, Python, and C++ implementations Why Keyczar? Cryptography is easy to get wrong.