Cryptology ePrint Archive: Report 2001/080
COS Ciphers are not "extremely weak"! - The Design Rationale of COS Ciphers
Eric Filiol and 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.
Category / Keywords: secret-key cryptography / stream cipher,cryptanalysis, COS, Non Linear Feedback Shift Registers, copyright protection
Date: received 17 Sep 2001
Contact author: Eric Filiol at inria fr
Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | BibTeX Citation
Version: 20010917:171103 (All versions of this report)
Short URL: ia.cr/2001/080
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