[Resource Topic] 2001/080: COS Ciphers are not "extremely weak"! - The Design Rationale of COS Ciphers

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Title:
COS Ciphers are not “extremely weak”! - The Design Rationale of COS Ciphers

Authors: Eric Filiol, Caroline Fontaine

Abstract:

This note summarizes the results of Babbage’s cryptanalysis of COS ciphers and shows that in fact COS ciphers are not weak as claimed. These ciphers have been designed according a novel concept of encryption directly determined by the context of use. This concept is here more precisely defined.

ePrint: https://eprint.iacr.org/2001/080

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