[cryptography] NIST Workshop on Elliptic Curve Cryptography Standards

dj at deadhat.com dj at deadhat.com
Tue May 12 20:00:24 EDT 2015


>
> There is a very simple way around this. Block XXTEA introduced a new
> method
[snip]
>
> Although for the internet and smart cards, data packets are small enough
> for 64 bit blocks not to matter as long as you rekey between packets.
>

To paraphrase Bowman: "Oh my God. It's full of integer adders!"
Integer adders don't pass the sniff test for lightweight hardware.

Alas, the world isn't just the internet and smart cards. We are throwing
crypto on silicon as fast as we can to address the many threats to
computer hardware. No one block size is correct.




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