Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2007-04-10
2007-04-10
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C380S277000
Reexamination Certificate
active
09573527
ABSTRACT:
The invention discloses a method of updating, in nodes on both ends of a secure link, the encryption key they share to encrypt and decrypt data. When having to transmit data from one of the nodes towards its peer remote node, a data base in the forwarding node, is first updated from the data to be transmitted. Then, encryption is performed and data transmitted to the peer remote node while a next-to-use encryption key is derived from the new contents of the data base. When received, data are decrypted with the current value of the encryption key and the peer remote node data base is updated identically from the received decrypted data after which a next-to-use encryption key is derived, thereby obtaining in the peer remote node, a next-to-use identical key. The data base is preferably the dictionary of a data compression/decompression system used simultaneously with encryption/decryption to transmit data over the secure link. While keys are frequently updated, for improved security, the invention does not require that key updates need to be actually distributed.
REFERENCES:
patent: 4935961 (1990-06-01), Gargiulo et al.
patent: 5003596 (1991-03-01), Wood
patent: 5412723 (1995-05-01), Canetti et al.
patent: 5495533 (1996-02-01), Linehan et al.
patent: 5517567 (1996-05-01), Epstein
patent: 5623546 (1997-04-01), Hardy et al.
patent: 5701468 (1997-12-01), Benayoun et al.
patent: 5729608 (1998-03-01), Janson et al.
patent: 5832087 (1998-11-01), Hawthorne
patent: 5864667 (1999-01-01), Barkan
patent: 5982891 (1999-11-01), Ginter et al.
patent: 5987128 (1999-11-01), Baba
patent: 6031912 (2000-02-01), Moulart et al.
patent: 6038322 (2000-03-01), Harkins
patent: 6055636 (2000-04-01), Hillier et al.
patent: 6084968 (2000-07-01), Kennedy et al.
patent: 6105133 (2000-08-01), Fielder et al.
patent: 6122379 (2000-09-01), Barbir
patent: 6131090 (2000-10-01), Basso et al.
patent: 6182214 (2001-01-01), Hardjono
patent: 6185685 (2001-02-01), Morgan et al.
patent: 6215878 (2001-04-01), Harkins
patent: 6263435 (2001-07-01), Dondeti et al.
patent: 6327595 (2001-12-01), Lyson et al.
patent: 6330671 (2001-12-01), Aziz
patent: 6336121 (2002-01-01), Lyson et al.
patent: 6347383 (2002-02-01), Elnozahy
patent: 6363154 (2002-03-01), Peyravian et al.
patent: 6367010 (2002-04-01), Venkatram et al.
patent: 6442688 (2002-08-01), Moses et al.
patent: 6483921 (2002-11-01), Harkins
patent: 6493449 (2002-12-01), Anshel et al.
patent: 6711709 (2004-03-01), York
Benayoun Alain
LePennec Jean-Francois
Michel Patrick
Dillon & Yudell LLP
International Business Machines - Corporation
LaForgia Christian
Sheikh Ayaz
Steinberg William H.
LandOfFree
Method of updating encryption keys in a data communication... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of updating encryption keys in a data communication..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of updating encryption keys in a data communication... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3747575