On: Announcing the first SHA-1 collision

[zurn]

Anyone have back of the envelope calculations for the cost of the CPU and GPU time?

[nickez → zurn]

On the shattered webpage:

This attack required over 9,223,372,036,854,775,808 SHA1 computations. This took the equivalent processing power as 6,500 years of single-CPU computations and 110 years of single-GPU computations.

[sp332 → nickez]

Hm, according to https://gist.github.com/epixoip/a83d38f412b4737e99bbef804a27... a GTX 1080 can do 8.54 billion SHA-1 hashes per second. That puts it at only 34.2 years to compute 9.22*10^18 hashes.

[cphoover → nickez]

So... you are saying I couldn't do this on my Macbook's Core i7?

[adrianN → cphoover]

If you're very careful with your machine maybe you can make it last 6500 years, but I think that is way outside the expected lifetime of a mobile CPU under full load.