Abstract
A running key generator consisting of a maximum-length (ML) linear feedback shift register (LFSR) and some nonlinear feedforward state filter function is investigated. It is shown how a cryptanalyst can find an equivalent system in a ciphertext-only attack. The analysis uses a Walsh orthogonal expansion of the state filter function and its relation to the crosscorrelation function (CCF) between the ML-sequence and the produced running key sequence.
Chapter PDF
Similar content being viewed by others
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
R.C. Titsworth, “Correlation Properties of Cyclic Sequences”, Thesis, California Inst. of Technology, Pasadena, California, 1962.
M.G. Karpovsky, “Finite Orthogonal Series in the Design of Digital Devices”, New York and Jerusalem, Wiley and IVP, 1976.
R.J. Lechner, “Harmonic Analysis of Switching Functions”, in “Recent Developments in Switching Theory”, edited by A. Mukhopadhyay, Academic Press, New York and London, 1971.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1986 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Siegenthaler, T. (1986). Cryptanalysts Representation of Nonlinearly Filtered ML-Sequences. In: Pichler, F. (eds) Advances in Cryptology — EUROCRYPT’ 85. EUROCRYPT 1985. Lecture Notes in Computer Science, vol 219. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-39805-8_12
Download citation
DOI: https://doi.org/10.1007/3-540-39805-8_12
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-16468-5
Online ISBN: 978-3-540-39805-9
eBook Packages: Springer Book Archive