Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Packet header designating cryptographically protected data
Reexamination Certificate
2005-11-15
2005-11-15
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Packet header designating cryptographically protected data
C713S151000
Reexamination Certificate
active
06965995
ABSTRACT:
A signal processing circuit capable of preventing illicit copies, preventing the circuit from being unable to discriminate a plurality of cipher mode and unable to decipher, and correctly decipher received data at the reception side, configured to be provided with a cipher mode continuity discrimination circuit which confirms the continuity of a cipher mode at the time of reading transmission data from an FIFO when transmitting a plurality of packets, stops the transmission when a discontinuity is confirmed even if there is room in a band enabling transmission in the transmission cycle of the 1394 standard, and instructs a link core to transmit the packet enciphered by a different cipher key at the next cycle, so that only the data enciphered by one cipher mode is transmitted within one cycle of the 1394 standards, and the data enciphered by a different cipher mode is transmitted in the next cycle.
REFERENCES:
patent: 4757536 (1988-07-01), Szczutkowski et al.
patent: 4817146 (1989-03-01), Szczutkowski et al.
patent: 5081678 (1992-01-01), Kaufman et al.
patent: 5896454 (1999-04-01), Cookson et al.
patent: 5978481 (1999-11-01), Ganesan et al.
patent: 6055316 (2000-04-01), Perlman et al.
patent: 6118873 (2000-09-01), Lotspiech et al.
patent: 6223285 (2001-04-01), Komuro et al.
patent: 6259694 (2001-07-01), Sato et al.
patent: 6343281 (2002-01-01), Kato
patent: 6408012 (2002-06-01), Sato
patent: 6463060 (2002-10-01), Sato et al.
patent: 6463151 (2002-10-01), Iitsuka et al.
patent: 6467093 (2002-10-01), Inoue et al.
patent: 6490355 (2002-12-01), Epstein
patent: 6526146 (2003-02-01), Hashimoto et al.
patent: 6539094 (2003-03-01), Osakabe et al.
patent: 6611534 (2003-08-01), Sogabe et al.
patent: 6622249 (2003-09-01), Komuro et al.
patent: 6636551 (2003-10-01), Ikeda et al.
patent: 6690798 (2004-02-01), Dent
patent: 0 874 503 (1998-10-01), None
patent: 0913975 (1999-05-01), None
“IEEE Standard for a High Performance Serial Bus”, Jul. 22, 1996, IEEE Standards, p. 1-384.
“5C Digital Transmission Content Protection White Paper” Internet Citation, Jul. 14, 1998, XP002213172 Retrieved from the Internet: <URL:http://www.dtcp.com/data/wp—spec.pdf> 'retrieved on Sep. 11, 2002!.
Frommer William S.
Frommer & Lawrence & Haug LLP
Presson Thomas F.
Revak Christopher
Sheikh Ayaz
LandOfFree
Signal processing circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal processing circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal processing circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3494542