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Method and system for machine enciphering and deciphering

  • US 4,157,454 A
  • Filed: 12/19/1977
  • Issued: 06/05/1979
  • Est. Priority Date: 12/22/1976
  • Status: Expired due to Term
First Claim
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1. Method for the enciphering and authorized deciphering of multi-digit data, comprisingsubjecting successive data segments, under control of corresponding segments of an enciphering key, to a substitution operation generating a modified version of the data segment;

  • andin each substitution operation, selecting one of several given modification modes, as a predetermined function of a data segment and the corresponding key segment for changing the enciphering key before the next substitution operation upon the next corresponding segment.

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