kevinkk5 wrote:1,000,000,000 would be interesting. but would take too long. recently i chose a too high chainlength so i got an error but i do not know which i took. and i´m not in linux at the moment
No, that wouldn't. That would be stupid.
I believe I may have hardcoded 1,000,000 as an upper limit on chain length because, right now, going beyond that is *stupid.*
Cracking time scales with chain length squared. To get an idea of how long the "precalculation" stage of cracking will take, you can ballpark it as follows:
(chain length) * (chain length) * (0.5) / (GPU speed on the hash in question)
Assuming 400M for a GPU (which a GT200 series can do - Fermis are faster, but I don't want to require a Fermi to use this):
Chain length 100,000: 12.5s of regen
Chain length 200,000: 50s of regen
Chain length 1,000,000: 1250s of regen (~21 mins)
Chain length 1,000,000,000: 1,250,000,000s of regen (39.5 years)
So, that chain length is stupid.