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Counting Functions and Expected Values for the k-Error Linear Complexity

โœ Scribed by Wilfried Meidl; Harald Niederreiter


Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
126 KB
Volume
8
Category
Article
ISSN
1071-5797

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โœฆ Synopsis


In cryptology, complexity measures for sequences of elements of a "nite "eld, such as the linear complexity, play an important role. Cryptographically strong sequences or "nite strings must not only have a large linear complexity, but also the change of a few terms must not cause a signi"cant decrease of the linear complexity. This requirement leads to the concept of the k-error linear complexity ยธLI (S) of a string S with terms in a "nite "eld F O and length n. In this article, bounds for the number of strings S of length n with k-error linear complexity ยธLI (S)"c or ยธLI (S)4c for a given c are established. Under certain conditions on n, k, and c, exact formulas are also determined. On the basis of these results we derive bounds for the expected value of ยธLI (S) for random strings S of length n.


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