Stream-cipher method and apparatus

Details Stream-cipher method and apparatus Stream-cipher method and apparatus

2005-04-12

2005-04-12

Morse, Gregory (Department: 2134)

Cryptography

Key management

Having particular key generator

C380S046000

Reexamination Certificate

active

06879689

ABSTRACT:
Methods and systems are provided for processing information. In one embodiment, there is provided a method, providing a frame key based on a master key and a frame number of a frame of information to a keystream generator as an initial fill for one or more registers of the keystream generator such that the initial fill establishes a state for the one or more registers of the keystream generator; and generating, at the keystream generator, a keystream sequence based on the state established by the initial fill, wherein the keystream sequence includes a modulo-2 sum of a lagged-Fibonacci sequence and a pseudo-random sequence produced by a filter generator.

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Maxiang Zhang et al., The Software-Oriented Stream Cipher SSC2, Springer-Verlag Berlin Heidelberg, Apr. 12, 2000, Lecture Notes in Computer Science: Proceedings of the 7th International Workshop of Fast Software Encryption, pp. 31-48.

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