Method and apparatus for synchronous stream cipher...

Cryptography – Communication system using cryptography – Time segment interchange

Reexamination Certificate

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C380S042000, C380S028000, C380S255000, C380S260000, C380S262000, C380S274000, C713S153000, C713S168000

Reexamination Certificate

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07734044

ABSTRACT:
A method and apparatus for a signal encryption device constructed to perform synchronous stream cipher encryption for a sequence of input words with restricted codes. The encryption device includes a keystream generator for producing a sequence of pseudorandom words from a key, and an adder that is used to sum the output of the keystream generator and the input words. A lookup table of size substantially twice the number of possible input words provides encrypted codes excluding restricted codes from the summed signal. A signal encryption and decryption system is constructed by including a second keystream generator for producing a second sequence of pseudorandom words from the key, and a second adder to produce a second summed signal from the output of the second keystream generator and the encrypted codes. A corresponding lookup table provides decrypted codes excluding restricted codes from the second summed signal.

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“Link Encryption for 1.5Gb/s1Serial Digital Interface”, SMPTE Standard for D-Cinema, The Society of Motion Picture and Television Engineers, Jun. 21, 2005, pp. 1-36, www.smpte.org.

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