3 ms·
They provide an estimate in their paper: > The monetary cost of computing the second block of the > attack by renting Amazon instances can be estimated from
by raphaelj 10y ago
They provide an estimate in their paper:
> The monetary cost of computing the second block of the
> attack by renting Amazon instances can be estimated from
> these various data. Using a p2.16xlarge instance,
> featuring 16 K80 GPUs and nominally costing
> US$ 14.4 per hour would cost US$ 560 K for the
> necessary 71 device years. It would be more economical
> for a patient attacker to wait for low “spot prices” of
> the smaller g2.8xlarge instances, which feature four K520
> GPUs, roughly equivalent to a K40 or a GTX 970. Assuming
> thusly an effort of 100 device years, and a typical spot
> price of US$ 0.5 per hour, the overall cost would be of
> US$ 110 K.
- arenaninja 10y agoI wonder if this is really the case. Because if we can drive storage costs much closer to zero (e.g.: a beefed up local server), we can keep storing hashes and the next collision should be much closer. Starting and stopping and throwing away the previous work does work out to $560K per collision, but doesn't it just keep getting cheaper if you keep going?
- alfalfasprout 10y agoEh, at that point you may as well buy the servers yourself and let them run on-premises. Even with power, etc. that cost could easily come down 50% or more. Once you own the servers, additional tasks just cost power.
- Strom 10y agoIn addition, as any bitcoin miner knows, AMD GPUs are actually far more efficient at calculating hashes.