Hi, V2 onions are a truncated SHA1. Doing an entire hash is expensive. V3 onions are an ed25519 key plus a suffix. So if you're just looking for a prefix, you can choose a random value. Then increment by the basepoint until you find the prefix you want. (This is a relatively cheap operation, because you're just adding 255-bit numbers.) You can save the expensive suffix calculations for the final candidate keys. Here's one implementation: https://github.com/Yawning/horse25519/blob/master/src/horse25519.c#L209 This is a summary: there are a few important details to get right, like key masking and security. T -- teor ----------------------------------------------------------------------

On 27 Apr 2020, at 06:37, niftybunny <abuse-contact@to-surf-and-protect.net> wrote:

Hi there,

quick question. Is there a fundamental time difference between brute forcing V3 to V2 Onion domains or did my 4 lucky feet just stopped working?

niftybunny

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