Re: What the voting experts think of bar codes

From: Karl Auerbach <karl_at_cavebear_dot_com>
Date: Fri Jun 04 2004 - 20:36:41 CDT

On Wed, 2 Jun 2004, David Mertz wrote:

> ...doesn't contain a covert channel to leak voter information?"

Way back in the dark ages, when computers were more expensive than the
typical programmer's house, and larger too, we found that we could send
about 300bit/second between processes just by modulating how we used
memory (and thus triggering page faults.)

One of the difficulties in defining "security" is realizing that there are
always low bandwidth covert channels that are nearly impossible to patch
short of physically moving the machine to a parallal universe. So the
issue become: A) "what is the maximum leakage bandwidth that we are
willing to tolerate?" and B) "can we compensate by adopting other (usually
physical) counter measures?"

                --karl--

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Received on Wed Jun 30 23:17:07 2004

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