DES 1973, NBS solicits proposals for cryptosystems for“ unclassified” documents 1974, NBS repeats request IBM responds with modification of LUCIFER NBS asks nsa to evaluate BM holds patent for dES 1975, details of the algorithm published, public discussion begins des became a federal standard in november 76 NBS(NIST hardware standard in January 77 ANSI X3.92-1981(hardware software ANSI X3 106-1983(modes of operation Australia As2805.5-19852 DES • 1973, NBS solicits proposals for cryptosystems for “unclassified” documents. • 1974, NBS repeats request. IBM responds with modification of LUCIFER. NBS asks NSA to evaluate. IBM holds patent for DES. • 1975, details of the algorithm published, public discussion begins. • DES became a federal standard in November 76 – NBS (NIST) hardware standard in January 77 – ANSI X3.92-1981 (hardware + software) – ANSI X3.106-1983 (modes of operation) – Australia AS2805.5-1985