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The FastDES algorithm is based on Data Encryption Standard (DES). In FastDES, the one round function concept of DES are used in three different customs to produce a new fast and more efficient secure algorithm. The DES operates on half of the input data, 32-bit of chunk out of 64 bits, while FastDES take block of 32-bit and work on it simultaneously. The encryption start from 32-bit of data and 32-bit of key bits, which passes from three consecutive rounds and 32-bit of cipher is produce. This algorithm is fast, so it can be used in many further securities mechanisms like Hash functions (MD5, SHA series, HMAC) and modes of the operation like CBC, CFB etc.
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