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

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

Authors: Eric Filiol, Caroline Fontaine


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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