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Paper 2000/040

Decimation Attack of Stream Ciphers

Eric FILIOL

Abstract

This paper presents a new attack called {\em Decimation Attack} of most stream ciphers. It exploits the property that multiple clocking (or equivalently $d$-th decimation) of a LFSR can simulate the behavior of many other LFSRs of possible shorter length. It yields then significqnt improvements of all the previous known correlation and fast correlation attacks provided a new criterion is satisfied. This criterion on the length of the feedback polynomial is then defined to resist the decimation attack. Simulation results and complexity comparison are detailed for ciphertext only attack.

Metadata
Available format(s)
PS
Category
Secret-key cryptography
Publication info
Published elsewhere. Corrected and revised version
Keywords
correlation attackfast correlations attacksequence decimationmultiple clocking
Contact author(s)
efiliol @ mailhost esm-stcyr terre defense gouv fr
History
2000-09-22: last of 3 revisions
2000-08-07: received
See all versions
Short URL
https://ia.cr/2000/040
License
Creative Commons Attribution
CC BY
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