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Cryptography Tools is a project to develop demonstration tools on classic (currently Caesar and Playfair) & modern crypto-systems, including private & public key encryptions, digital signatures, cryptographic hashes and authenticated encryption.
HMKrypt is a set of tools that aim to provide quick, easy to use and still somehow secure encryption. It's based on a hexadecimal table. You can get the table from either the source, or the HMKryption tool, and memorize it.