The Data Encryption System (DES)

The Data Encryption System (DES) is a cryptographic algorithm approved by the Federal Information Processing Standards (FIPS) for encrypting and decrypting binary code information (Data, 1988). Enciphering and deciphering operations are based on a binary number called a key. The key consists of 64 binary digits which are either "O"s or "I"s. Fifty-six bits are randomly generated and used directly in the algorithm, and the remaining 8 are used for error detection. They make each 8-bit byte of the key odd. Authorized users of encrypted computer data need the key used to encrypt the data to decipher it. The algorithm in this standard is known by people who use this standard, but the use of a unique key makes the algorithm unique. Unauthorized recipients cannot decrypt the data unless they get hold of the unique key, even if they know the algorithm.

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