grinding down chips was Re: QX10 graphics board
Gordon JC Pearce
gordonjcp at gjcp.net
Sun Jan 29 04:51:55 CST 2006
Philip Pemberton wrote:
> In message <220.127.116.11.20060127101019.441734dc 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.
That's why the encryption cards banks use for ATMs detect when they get
below a certain temperature, and overwrite the RAM.
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