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Sequences with almost perfect linear complexity profiles and curves over finite fields

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2 Author(s)
Chaoping Xing ; Sch. of Comput., Nat. Univ. of Singapore, Singapore ; Kwok Yan Lam

For stream ciphers, we need to generate pseudorandom sequences which are of properties of unpredictability and randomness. A important measure of unpredictability and randomness is the linear complexity profile (l.c.p.) la(n) of a sequence a. A sequence a is called almost perfect if the l.c.p. is la(n)=n/2+O(1). Based on curves over finite fields, we present a method to construct almost perfect sequences. We also illustrate our construction by explicit examples from the projective line and elliptic curves over the binary field

Published in:

Information Theory, IEEE Transactions on  (Volume:45 ,  Issue: 4 )

Date of Publication:

May 1999

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