Today's fastest general purpose microprocessors have performance equaling or exceeding that of the fastest available DSP chips. This paper argues that signal processing applications will migrate from specialized DSP coprocessors into the host processor of high performance personal computers and workstations. DSP chips will have a place in synchronous, low latency data handling, but increasingly, the computation of signal processing algorithms will be handled by general purpose processors. Keywords: digital signal processing, RISC c flDigital Equipment Corporation 1992. All rights reserved. 1 A version of this paper appeared in the International Conference on Signal Processing Applications and Technology on November 2-5, 1992. 1 1 Introduction The price/performance of computer hardware has been improving at a rate of about 50 percent per year. Each year, the same amount of money will buy a machine 50 percent faster than the year before. This trend is driven by semiconductor techno...

Organizations often impose an administrative security policy when they connect 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-specific "relays" that allow the use of applications across organizational boundaries. In particular, we focus on analyzing administrative and application-specific security policies to construct solutions that satisfy the security requirements while providing the necessary functions of the applications. This is a preprint of a paper to appear in the Proceedings of the USENIX Summer Conference, June, 1993. c flUSENIX Association 1993. Permission to copy without fee all or part of this material is granted, provided that the copies are not made or distributed for commercial advantage, the USENIX Association copyright notice and the ti...