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Data Encryption Standard

DES (Data Encryption Standard) was created in the nineteen seventies by IBM in association with the NSA (National Security Agency). It was based on Horst Feistel's ideas and used a 64bit block cipher and a 64bit cipher key. This standard was adopted as the FIPS (Federal Information Processing Standard) and used extensively by the US Government. Unfortunately the short key length and other weaknesses in the algorithm proved the standard to be weak, and much work has been done to improve its robustness. DES has now evolved into TDES (Triple DES) which provides a higher level of protection to data.

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