Newsgroups: sci.crypt Path: cactus.org!milano!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!think.com! + mips!pacbell.com!network.ucsd.edu!qualcom.qualcomm.com!chicago.qualcomm. + com!karn From: karn@chicago.qualcomm.com (Phil Karn) Subject: Re: generating one-time pads Message-ID: <1992Jun27.093604.9831@qualcomm.com> Sender: news@qualcomm.com Nntp-Posting-Host: chicago.qualcomm.com Organization: Qualcomm, Inc References: <2668@accucx.cc.ruu.nl> <2796@accucx.cc.ruu.nl> <1992Jun27.064216. + 21116@cactus.org> Date: Sat, 27 Jun 1992 09:36:04 GMT Lines: 13 I propose a simple experiment. Widen the counter that is incremented in the tight loop to 16 or 32 bits, and save the full counter value on each interrupt. Then run an autocorrelation on the results. This should give you a good idea of just what the oscillator phase noise process, plus other perturbing processes, like memory refresh, looks like. And from that you should be able to determine how often to sample, and how many bits to save from each sample, without impairing the randomness of the result. Phil