28 Jan
2006
28 Jan
'06
4:01 p.m.
In message <3.0.6.16.20060127101019.441734dc at pop-server.cfl.rr.com>
"Joe R." <rigdonj at cfl.rr.com> wrote:
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.
Both of these "behavioural artifacts" have been documented extensively. It
is, however, a minute past midnight and I honestly can't remember where I
read about this...
--
Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT
philpem at dsl.pipex.com | Athlon64 3200+ A8VDeluxe R2 512MB+100GB
http://www.philpem.me.uk/ | Panasonic CF-25 Mk.2 Toughbook
... Monday is the root of all evil!