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A Distinguish attack on COSvd Ciphers
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Abstract: | Abstract: The COSvd Ciphers has been proposed by Filiol and others (2004). It is a strengthened version of COS stream cipher family denoted COSvd that has been adopted for at least one commercial standard. We propose a distinguish attack on this version, and prove that, it is distinguishable from a random stream. In the COSvd Cipher used one S-Box (10?8) on the final part of cipher. We focus on S-Box and use weakness this S-Box for distinguish attack. In addition, found a leak on HNLL that the sub s-boxes don?t select uniformly. We use this property for an Improve distinguish attack. |
BibTeX
@misc{eprint-2005-12500, title={A Distinguish attack on COSvd Ciphers}, booktitle={IACR Eprint archive}, keywords={secret-key cryptography / Stream cipher, COSvd cipher, Distinguish attack, nonlinear feedback shift registers, chaotic layer.}, url={http://eprint.iacr.org/2005/164}, note={ maorum@yahoo.com 12919 received 16 May 2005}, author={Mohammad Ali Orumiehchi ha and Dr.R. Mirghadri}, year=2005 }