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Comment by Hamuko | Hacker News Reader

Is there a Hashcat-as-a-Service or is everyone just renting out EC2 GPU instances by the hour?

Most hashes can be cracked with onlinehashcrack.com -- They are free if its under 8 characters and something like 5$ if its not. You can submit as many as you want and if they don't crack it. its free

Is there something similar for Ethereum presale wallet hashes?

I have a wallet of which I know enough of the password to reduce the space to < 10 chars that need to be guessed.

Check out the configuration for a masked attack [0]. You could create a custom character set with the portion that you know and then brute the rest. You could then rent a p2.16xlarge [1] from AWS at about $15 per hour. If you know how much coin is in there you can do a cost/benefit analysis.

[0] https://hashcat.net/wiki/doku.php?id=mask_attack#custom_char... [1] https://aws.amazon.com/ec2/instance-types/p2/

Thanks! That looks fairly simple, I'll try to set it up on my machine first but even a p2 instance will be worth it in this case.

https://gpuhash.me/

Forge by Inferno Systems wraps hashcat with a workflow more conducive to non-technical people. That currently requires on-site but I believe they have a cloud offering planned: https://inferno-systems.com/forge/index.html

I personally choose not to send client hashes into untrusted environments. I’d maybe consider EC2 with client permission, but not other dodgy services.

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