Data dependent scrambler with reduced overhead

Details Data dependent scrambler with reduced overhead Data dependent scrambler with reduced overhead

2003-11-17

2008-12-23

Zia, Syed A. (Department: 2131)

Cryptography

Video cryptography

Video electric signal modification

C380S200000, C714S758000, C714S752000, C714S781000, C713S189000, C713S193000

Reexamination Certificate

active

07469049

ABSTRACT:
A data dependent scrambler for a communications channel that receives a user data sequence including X bits that are organized as N M-bit symbols includes a seed finder that generates a scrambling seed that is dependent upon the symbols in the user data sequence. A first scrambler receives the user data sequence from the data buffer and the scrambling seed from the seed finder and generates the scrambled user data sequence. An H-code finder generates at least one of an H-code token that is dependent upon the symbols in the user data sequence and an offset of the H-code token from the scrambling seed. An H-code encoder receives the scrambled user data sequence and at least one of the H-code token and the offset. The H-code encoder increases a Hamming weight of the scrambled user data sequence using the at least one of the H-code token and the offset.

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