>From the Abstract: TCP (RFC793 [1]) is widely deployed and one of the most often used reliable end to end protocols for data communication. Yet when it was defined over 20 years ago the internet, as we know it, was a different place lacking many of the threats that are now common. Recently several rather serious threats have been detailed that can pose new methods for both denial of service and possibly data injection by blind attackers. This document details those threats and also proposes some small changes to the way TCP handles inbound segments that either eliminate the threats or at least minimize them to a more acceptable level. http://www.ietf.org/internet-drafts/draft-ietf-tcpm-tcpsecure-00.txt This is in response to Technical Cyber Security Alert TA04-111A http://www.us-cert.gov/cas/techalerts/TA04-111A.html Regards Thor Larholm Senior Security Researcher PivX Solutions 24 Corporate Plaza #180 Newport Beach, CA 92660 http://www.pivx.com thor@pivx.com Phone: +1 (949) 231-8496 PGP: 0x5A276569 6BB1 B77F CB62 0D3D 5A82 C65D E1A4 157C 5A27 6569 PivX defines "Proactive Threat Mitigation". Get a FREE Beta Version of Qwik-Fix <http://www.qwik-fix.net>