A TRUE (not pseudo) random number Chip by AT&T (T7001)

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2 total messages Started by Albert Boulanger Sat, 06 Jan 1990 22:16

#4300

Author: Albert Boulanger
Date: Sat, 06 Jan 1990 22:16

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I noticed the spec sheet for this little guy in the Sams book "Video
Scrambling & Descrambling" Rudolf Graf, & William Sheets. The specs
for this chip say that it produces TRULY random bits based on the
phase jitter of a free-running oscillator. It is a companion chip to
AT&T's T7000A DES chip.

Is there any analysis of the quality of the random numbers based on
the technology used in this chip? I have been thinking of a similar
idea but based on XORING a bank of free running oscillators (which is
in turn based on a simple asynchronous random sequence algorithm I
have been playing with for MIMD machines). Is there some general
analysis and description of this generic class of methods for
producing random sequences?



Inquiringly yours,
Albert Boulanger
BBN Systems & Technologies Corp.
aboulanger@bbn.com

Re: A TRUE (not pseudo) random number Chip by AT&T (T7001)

#4301

Author: Mark Robert Thorson
Date: Sun, 07 Jan 1990 20:56

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One pitfall to consider is the possibility that the free-running
oscillators might get coupled to each other by the noise they inject
into the power supply rails.  Obviously, this would prevent them from
being truly free-running, hence you might end up with less randomness
than you would otherwise expect.

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