I started looking into doing cryptography, in particular digital signatures, on an 8bit AVR. I came to realize that 2048RSA or 256ECDSA is too slow for this. Originally I looked at an ARM but since this is overkill (except for the ECDSA part then) and generally consumes more power I'd rather stay with AVR 8bit. So I started looking for solutions and came across the ATECC108A (http://www.atmel.com/devices/ATECC108A.aspx). I have the following questions:
1) Why doesn't this seem to be widely used? Is it because crypto on 8bit MCU's is uncommon or are there other/better solutions?
2) I can't find this product available anywhere and the delays seems to be very long (until July). it seems that it's a new device. Does anyone have any alternatives that they can recommend?
It would be great if someone has more info on this, thanks!