System and method of per-packet keying

Details System and method of per-packet keying System and method of per-packet keying

2011-03-22

2011-03-22

Orgad, Edan (Department: 2439)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S172000, C380S037000

Reexamination Certificate

active

07913085

ABSTRACT:
A method of per-packet keying for encrypting and decrypting data transferred between two or more parties, each party having knowledge of a shared key that allows a per-packet key to differ for each packet is provided. Avoiding the use of a static session key during encryption offers several advantages over existing encryption methods. For example, rejecting packets received with duplicate sequence numbers, or sequence numbers that are beyond a specified deviation range mitigates Replay Attacks.

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patent: RE39589 (2007-04-01), Raivisto
patent: 2003/0210788 (2003-11-01), Billhartz et al.
KoolSpan Technology: What You Need To Know; Jun. 13, 2006; http://web.archive.org/web/20060513052121/www.koolspan.com/.
Cisco Security Advisory: Cisco IOS Software TCP Initial Sequence Number Randomization Improvements; Document ID 13631; Jan 7, 2004.
Notification of Transmittal of the International Search Report and the Written Opinion of the International Searching Authority, or the Declaration, dated Jul. 17, 2008.

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