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Add probability equation to README #112

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16 changes: 12 additions & 4 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -87,10 +87,18 @@ performance-related tips.

* How long is it going to take?

Because of probablistic nature of brute force key generation, and
varience of hardware it's going to run on, it's hard to make promisses
about how long it's going to take, especially when the most of users
want just a few keys.\
Because of the probablistic nature of brute force key generation, and
varience of hardware it's going to run on, it's hard to make promises
about how long it's going to take, especially when most users want
just a few keys.

The probabilty can be calculated with this equation:\
$T={32^N \over H}$\
where:\
*T* is the average time to a match.\
*N* is the length of the filter.\
*H* is the number of calculations per second.

See [this issue][#27] for very valuable discussion about this.\
If your machine is powerful enough, 6 character prefix shouldn't take
more than few tens of minutes, if using batch mode (read
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