Cryptography – Communication system using cryptography – Time segment interchange
Reexamination Certificate
2006-02-23
2010-06-08
Zia, Syed A. (Department: 2431)
Cryptography
Communication system using cryptography
Time segment interchange
C380S042000, C380S028000, C380S255000, C380S260000, C380S262000, C380S274000, C713S153000, C713S168000
Reexamination Certificate
active
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.
REFERENCES:
patent: 6587562 (2003-07-01), Jansen et al.
patent: 6909785 (2005-06-01), Rose
patent: 6944253 (2005-09-01), Ozluturk
patent: 6975730 (2005-12-01), Kuroiwa et al.
patent: 7058178 (2006-06-01), Jansen et al.
patent: 7190787 (2007-03-01), Graunke et al.
patent: 7206940 (2007-04-01), Evans et al.
patent: 2001/0031050 (2001-10-01), Domstedt et al.
patent: 2002/0006137 (2002-01-01), Rabenko et al.
patent: 2002/0186840 (2002-12-01), Rose
patent: 2003/0012406 (2003-01-01), Iwamura
patent: 2003/0161467 (2003-08-01), Cheng et al.
patent: 2004/0034772 (2004-02-01), Alao
patent: 2004/0086117 (2004-05-01), Petersen et al.
patent: 2006/0193472 (2006-08-01), Yuen
“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.
Brady III Wade James
Brill Chrles A.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
Zia Syed A.
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