On tisdag 19 juli 2016 kl. 17:24:37 CEST Leif Johansson wrote: > Skickat från min iPhone > > > > 19 juli 2016 kl. 17:02 skrev Jakob Schlyter <ja...@kirei.se>: > > > > On 2016-07-19 at 16:49, Basil Dolmatov wrote: > > > > > >>> Stated differently, the tamper daughterboard could feed the VBAT on the > >>> Alpha instead of being fed by the VBAT on the Alpha. > >>> > >>> Any downsides to that? > >> > >> Daughter board can be absent, this should not lead to unusable tamper > >> processor. > > > > > But without tamper sensors, what should the tamper processors do? > > Handle the panic button
If the tamper processor is operating with the panic button as the only tamper input "sensor", I think a jumper from VCCO_3V3 to VBAT is adequate to power it. If you want to use a battery instead, by all means wire a single cell CR2032 battery to the VBAT header that is on the rev03 already. The discussion with Rick led us to thinking that unless we have a true 10-year battery solution, it might be better to have the actual battery outside the tamper protection where it might be replaced (envisioning a meshed tamper bag here, among other things). This of course means there should be enough power to wipe keys _inside_ the tamper boundary too - in form of one or more of these super-caps presumably. /Fredrik _______________________________________________ Tech mailing list Tech@cryptech.is https://lists.cryptech.is/listinfo/tech
