4 ms·
So they created a giant side-channel by putting their entropy-source next to a public window?
by Chaebixi 9y ago
So they created a giant side-channel by putting their entropy-source next to a public window?
- serf 9y agodon't forget the room heating. I'm sure a wall of of 25-100w incandescents can get pretty toasty. very green.
- CodeWriter23 9y agoPretty sure an attacker would have to observe the array from the same point of perspective as the camera to mount a successful side channel attack.
- CorvusCrypto 9y agoI'm guessing they use this alongside CSPRNGs. Would make sense given the theorem that states any random number XORed with even highly-ordered input maintains its entropy.
- londons_explore 9y agoThere are lots of people in the crypto world who have serious issues with XORing random sources together. I haven't yet seen a good argument why it's a bad idea, and part of me thinks it might be a way to get more software using "rdrand" or other insecure sources unmodified.
- CorvusCrypto 9y agoI think the bad idea stigma stems from people XORing from the same source. That totally is a bad idea, but if two sources are wholly independent, the maximum entropy in the combined systems is maintained. To the people that just say it's never a good idea and scoff at any reasoning I'd remind them about OTPs. They are a special case related to this principle of XORing two independent sources together where only one input is random and it is proven mathematically to work.