Hitless manual cryptographic key refresh in secure packet...

Details Hitless manual cryptographic key refresh in secure packet... Hitless manual cryptographic key refresh in secure packet...

2003-12-22

2009-08-25

Zand, Kambiz (Department: 2439)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular node for directing data and applying cryptography

C713S160000, C713S176000, C713S180000, C726S003000, C726S012000, C726S013000, C726S014000, C380S028000, C380S278000

Reexamination Certificate

active

07581093

ABSTRACT:
In a hitless manual cryptographic key refresh scheme, a state machine may be independently maintained at each network node. The state machine may include a first state, a second state, and a third state. In the first state, which may be the steady state, a current cryptographic key may be used both for generating signatures for outgoing packets and for authenticating signatures of incoming packets. In the second state, which is entered when a new cryptographic key is provisioned, the old (i.e. formerly current) key may still be used for generating signatures for outgoing packets, however one or, if necessary, both of the old key and the newly provisioned key may be used for authenticating signatures of incoming packets. In the third state, the new key may be used for generating signatures for outgoing packets and either one or both of the old key and new key may be used for authenticating signatures of incoming packets.

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F. Baker Cisco, B. Lindell USC/ISI, M. Talwar Microsoft, “The Resource Reservation Protocol (RSVP) Cryptographic Authentication ”—Request for Comment (RFC) 2747, Jan. 2000; http://www.ietf.org/rfc/rfc2747.txt.
Open Shortest Path First (OSPF) Version 2—Request for Comments (RFC) 2328 http://www.ietf.org.rfc/rfc2328.txt.
The Resource Reservation Protocol (RSVP) Crytographic Authentication—Request for Comments (RFC) 2747 http://www.ietf.org/rfc/rfc2747.txt.

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