Synchronous stream cipher

Details Synchronous stream cipher Synchronous stream cipher

2006-06-06

2006-06-06

Peeso, Thomas R. (Department: 2132)

Cryptography

Communication system using cryptography

Time segment interchange

C380S042000, C380S036000, C380S274000

Reexamination Certificate

active

07058178

ABSTRACT:
A synchronous data-stream generator, suitable for use as a synchronous stream cipher providing copy right protection for audio/video data, generates a stream of output data items in synchronisation with a clock trigger. The data-stream generator comprises at least two parallel arranged subgenerators Mi, i≧1, such as linear feedback shift registers. The output of the subgenerators Miis combined forming the output data items of the data-stream generator. A control subgenerator C is used for generating a stream of control data items. Control means (150) comprises for at least one subgenerator Mian associated number selector Sifor, in dependence on the control data item of the control subgenerator C, selecting a number ni,jfrom a group Hiof different integer numbers. At least two numbers of the group Hiare larger than zero. The control means (150) causes the associated subgenerator Mito provide at the output the selected ni,j-th data item successive to a last generated data item (effectively skipping ni,j−1 data items).

REFERENCES:
“Handbook of Applied Cryptography”, A.J. Mendez et al., CRC Press, 1997, pp. 209-211.

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