I was reading hashcat's About page, and the stats are listed in terms of c/s....is that "Cracks per seconds"....the 'c' part seems wrong, I'm just guessing. What is 'c'?

1 Answer 1


"c/s is "crypts" (password hash or cipher computations) per second"

Quoted from the John the Ripper FAQ: http://www.openwall.com/john/doc/FAQ.shtml

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    So technically it means the same basic thing as your guess if you think about it... Aug 28, 2014 at 20:02
  • I think we all agree on what's measured, but do you have a source for "crypts"? Seems equally likely that they intend c as an abbreviation for (hash) calculations per second. Crypts seems like the wrong terminology for hashing (unless its something like bcrypt where the hash is built from a cipher).
    – dr jimbob
    Aug 28, 2014 at 21:14
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    Added in edit the source above. Aug 28, 2014 at 22:47
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    @drjimbob: The Unix password hashing function is named crypt(), because in early implementations it actually used the DES cipher. For compatibility, they didn't change the name when they changed the algorithm. Aug 29, 2014 at 7:14

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