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A distributed multipurpose mail guard

: Wolthusen, S.


National Security Agency; IEEE Systems, Man, and Cybernetics Society; United States, Military Academy, Department of Electrical Engineering and Computer Science:
Fourth Annual IEEE SMC Information Assurance Workshop 2003. Proceedings
West Point, New York, 2003
ISBN: 0-7803-7808-3
Annual Information Assurance Workshop <4, 2003, West Point/NY>
Conference Paper
Fraunhofer IGD ()
computer communication network; E-mail; operating systems; computer security; cryptographic control

This paper describes a mechanism for incorporating a mail guard mechanism together with automatic, mandatory, and fully transparent digital signatures and encryption for message traffic embedded into the operating system of individual network nodes. By intercepting all inbound and outbound network traffic and analyzing for pertinent information using generalized Büchi automata, the guard mechanism can enforce the application of (centralized) mail security policies without requiring any support from mail clients. An implementation based on modular modifications to the Microsoft Windows NT/2000/XP family of operating systems and OpenPGP-based messaging is described.