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The Data Encryption Standard

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The Data Encryption Standard, usually referred to by the acronym DES, is a well-established encryption algorithm which was first standardized by NIST in the 1980s. It is described in detail earlier in this book, in Chapter 10, so only the basic information about the algorithm is presented here.

While DES has largely been superseded by the AES (Advanced Encryption Algorithm) it is now common to find the algorithm being used in triplicate (an algorithm known as Triple-DES or TDES for short). This algorithm uses the same DES core, but uses three passes with different keys. DES was designed to be small and fast, and the algorithm is mainly based on shuffling and substitution. There is very little computation involved, which makes it ideal for hardware implementation.

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