Description: Symmetric cryptosystem trends will focus on block cipher. Block cipher algorithm is usually extended by the key algorithm and encryption (decryption) algorithm is composed of two parts. Key Expansion Algorithm will b-byte master key customers to expand into r sub-key. Encryption algorithm from a weak cryptography on the function f and r sub r th iteration key component. The spread of chaos and key block cipher algorithm is the basic principle of design. Explicitly known to resist differential and linear attacks, variable length keys and grouping of the system design features.
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