EUROCRYPT 1982: Cryptography pp 263-279 | Cite as

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

Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 149)


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. The principle is shown in Figure 1. 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.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1983

Authors and Affiliations

  1. 1.National Physical LaboratoryTeddington, MiddlesexUK

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