Path: cactus.org!milano!cs.utexas.edu!uunet!mcsun!sun4nl!alchemy!accucx! + nevries From: nevries@accucx.cc.ruu.nl (Nico E de Vries) Newsgroups: sci.crypt Subject: Re: IBM-PC random generator, source included Message-ID: <2809@accucx.cc.ruu.nl> Date: 25 Jun 92 09:45:07 GMT References: <2673@accucx.cc.ruu.nl> <1992Jun23.080147.15804@cactus.org> + <2797@accucx.cc.ruu.nl> <1992Jun24.184848.21881@cactus.org> + <1992Jun25.033711.26770@massey.ac.nz> Organization: Academic Computer Centre Utrecht Lines: 31 In <1992Jun25.033711.26770@massey.ac.nz> T.Drawneek@massey.ac.nz (Ted Drawneek) writes: >Terry Ritter writes: >> Of course I "believe" in jitter. I started out as a hardware >> person. It is not at all unusual to see a scope display jitter >> when retiming signals from different clocks in a computing system. >> That does not make the system nondeterministic. >The phase noise present even in crystal oscillators is nondeterministic. >Suppose you have two oscillators in phase at the same frequency, each >driving some sort of trigger so that nominally they both trigger at the >same time. Then would they actually both trigger at the same time? >Probably not - you would find that sometimes one would be before the other, >at other times it would be later, if you looked closely enough. Great. Thats excactly what I expected. Does anyone know WHY the "phase noise" (new term :-)) is nondeterministic? Has this been investigated? Are there papers which claim this? >Ted Drawneek Nico E. de Vries _ _ O O USENET nevries@cc.ruu.nl FIDO 2:281/708.1 COMPUSERVE "soon" (tm) o This text reflects MY opinions, not that of my employer BITECH. \_/ This text is supplied 'AS IS', no waranties of any kind apply. Don't waste your time on complaining about my hopeless typostyle. "Unfortunately, the current generation of mail programs do not have checkers to see if the sender knows what he is talking about" (A.S. Tanenbaum)