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X Through the Firewall, and Other Application Relays

G. Winfield Treese
MIT Laboratory for Computer Science and Digital Equipment Corporation

Alec Wolman
University of Washington and Digital Equipment Corporation


Organizations often impose an administrative security policy when they co nnect to other organizations on a public network such as the Internet. Many applications have their own notions of security, or they simply rely on the security of the underlying protocols. Using the X Window System as a case study, we describe some techniques for building application-specic relays that allow the use of applications across organizational boundaries. In particular, we focus on analyzing administrative and application-specic security policies to construct solutions that satisfy the security requirements while providing the necessary functions of the applications.

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