29 Jan
2006
29 Jan
'06
2:51 a.m.
Philip Pemberton wrote:
In message <3.0.6.16.20060127101019.441734dc at
pop-server.cfl.rr.com>
"Joe R." <rigdonj at cfl.rr.com> wrote:
That's why the encryption cards banks use for ATMs detect when they get
below a certain temperature, and overwrite the RAM.
Gordon
You'd probaly better with battery backed
RAM that would lose it power
(and contents) when it was removed from the circuit. Or else redisign and
use a PAL or some form or programmable logic that has a security fuse to
prevent it from being read.
Problem is, SRAM has this annoying tendency of storing data for a really long
time if it's frozen beforehand.
It also tends to "remember" data bits that have been stored in the memory
cells without any writes for a long time.