@Anticimex said in Security & Signing:

Also, what sources have you checked? It should be possible to source the single write variant online without problem.

Thanks heaps for your prompt reply!

I've looked at Mouser and Digi-Key and they have a $60 minimum for free postage (I don't want to order 100 for free shipping at this stage obviously as I'm only prototyping) and I can't bring myself to spending $25 on shipping for around $5.00 of modules .
Which leaves me with my normal supplier of Element14 (formally Farnell) where I get free shipping regardless of order quantity. but they don't source the Single-Wire ones at all.

I was going to put a post over on the OTA Flash forum as well as I'm having issues sourcing the AT25DF512C (it's been discontinued) and was looking at an ATAES132A (Datasheet <here> using an SPI interface) as I accidentally ordered some of them for another project and thought maybe it would be possible to combine both the security signing and OTA flash in the one component (Which is a HUGE assumption as to its use). As mentioned earlier, I'm still fairly new to the engineering side of hardware so I may be way off the mark.

Hi Guys,
Long time reader and first time poster.
Now a general disclaimer, I'm only fairly new to the IoT world of home automation sensors and am looking at the crypto side of signing devices as I thought if I'm going to do it, I'm going to do it right from the start with signing and utilizing OTA abilities.

I have a quick question regarding the ATSHA204 component. I know that the SenseBender uses a ATSHA204-STUCZ (the Single-Wire interface config) but I can't get these sourced through my normal supplier.

I am able to source ATSHA204A-SSHDA-B though, and was wondering if this would work instead, even though it's an I2C interface config instead. If not, how much work is involved to get it to work?

Thanks Heaps