Stream cipher design with revolving buffers

Details Stream cipher design with revolving buffers Stream cipher design with revolving buffers

H - Electricity

04

L

H04L 9/18 (2006.01)

Patent

CA 2497935

Techniques are disclosed to limit short-term correlations associated with outputs of stream cipher keystream generators. Output values of a generator are paired such that the paired outputs are sufficiently far apart to be considered independent. In one described implementation, a method includes sequentially storing a plurality of results provided by a stream cipher output rule in a first, second, and third storage units. A pairing function pairs individual values from the first and third storage units that are at least a threshold value apart. Upon reaching the threshold value of the output rule results, the contents of the first, second, and third storage units are rotated serially.

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