Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2005-03-31
2009-12-29
Dada, Beemnet W (Department: 2435)
Cryptography
Communication system using cryptography
Time segment interchange
Reexamination Certificate
active
07639801
ABSTRACT:
A method of transforming a serial scrambler to a parallel scrambler, a parallel scrambler and a double-edge-triggered register with XOR operation are provided. The method transforms a serial scrambler to a parallel scrambler according to a characteristic polynomial:P(x)=∑q=0Ncqxqorb(i)=∑q=1Ncqb(i-q).The method first determines a transformation formula:b(kN+i)=∑q=1Ncqb((k-R)N+i+R(N-q))according to the parameters of the characteristic polynomial. The parallel bits Bj=[bMj, bMj+1, . . . , bMj+M−2, bMj+M−1] are arranged in order. The transformation number R=2t(the initial number of t is 0) is set. The parallel bits are replaced by the transformation formula. When (k−R)N+i+R(N−q) is larger than Mj−1 in the transformation formula, 1 is added to t in the transformation formula R=2tand the transformation formula is re-counted. Finally, the XOR gates are connected to the registers according to a computed result from the transformation formula.
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Chen Chih-Ning
Hsiao Ju-Yuan
Jou Shyh-Jye
Lin Chih-Hsien
Wang You-Jiun
Dada Beemnet W
J.C. Patents
National Central University
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