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The Average Cycle Size of the Key Stream in Output Feedback Encipherment

  • Donald W. Davies
  • Graeme I. P. Parkin
Conference paper

Summary

Output feedback is a method of using the ‘Data Encryption Standard’ (DES), and it is defined in Federal Information Processing Standards Publication 81 produced by the US National Bureau of Standards. Its purpose is to provide a method of using the DES without error extension, since both encipherment and decipherment consist of adding a‘key-stream’ modulo 2 to the data stream. It has been defined for the values m = 1, 2, 3 .... 64 of the parameter m, which is the feedback width.

Keywords

Output Feedback Finite State Machine Stream Cipher National Physical Laboratory Average Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • Donald W. Davies
    • 1
  • Graeme I. P. Parkin
    • 1
  1. 1.National Physical LaboratoryTeddington, MiddlesexUK

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