[Cryptech Tech] Alpha board BOM and PCB design requirements

[Peter Gutmann]

Warren Kumari <warren at kumari.net> writes:

>All of this suggests (to me at least) that we will need something much
>beefier than a little coin-cell. For example, one of the HSMs I took apart
>had 2 D cell NiCad batteries inside the tamper boundary.  

Did they really have NiCads?  That's probably the least reliable technology
for long lifetime, the ones I've seen are all (non-rechargeable) lithium,
anything from CR2354s to CR123s and the like.  They also typically have two
batteries so you can swap one while the other is powering the HSM.

Peter.