Re: Gathering entropy for PRNGs on MVS

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From: Paul Rubin
Date: Mon, 10 Mar 2003 16:46

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"Duke Arber" <duke_arber@yahoo.com> writes:
> Does anyone know of data sources on MVS available to non-authorized programs
> with sufficient entropy for seeding PRNGs?

That means you're running on a virtual machine, right?  There's no
entropy at all.  Well, maybe you can sample a CPU cycle counter over a
long period or something like that.  There could be some entropy there
because of how other VM's on the same physical machine cause your
program to have more or less cache hits and misses.

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References: <b4ieak$2qn$1@slb9.atl.mindspring.net>

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From: Paul Rubin <http://phr.cx@NOSPAM.invalid>
Newsgroups: sci.crypt.random-numbers,bit.listserv.ibm-main,sci.crypt
Subject: Re: Gathering entropy for PRNGs on MVS
References: <b4ieak$2qn$1@slb9.atl.mindspring.net>
Date: 10 Mar 2003 08:46:42 -0800
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