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IEICE TRANSACTIONS on Fundamentals

Computing the k-Error Linear Complexity of q-Ary Sequences with Period 2pn

Zhihua NIU, Zhe LI, Zhixiong CHEN, Tongjiang YAN

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Summary :

The linear complexity and its stability of periodic sequences are of fundamental importance as measure indexes on the security of stream ciphers and the k-error linear complexity reveals the stability of the linear complexity properly. Recently, Zhou designed an algorithm for computing the k-error linear complexity of 2pn periodic sequences over GF(q). In this paper, we develop a genetic algorithm to confirm that one can't get the real k-error linear complexity for some sequenes by the Zhou's algorithm. Analysis indicates that the Zhou's algorithm is unreasonable in some steps. The corrected algorithm is presented. Such algorithm will increase the amount of computation, but is necessary to get the real k-error linear complexity. Here p and q are odd prime, and q is a primitive root (mod p2).

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E95-A No.9 pp.1637-1641
Publication Date
2012/09/01
Publicized
Online ISSN
1745-1337
DOI
10.1587/transfun.E95.A.1637
Type of Manuscript
LETTER
Category
Cryptography and Information Security

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