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From the documentation

MaxLen = LENGTH

Maximum password length to try. The default is 8 (or CHARSET_LENGTH as defined in src/params.h at compile time).

I've compiled it to support up to 62 characters, modified john.conf, but when running john it returns:

Incompatible charset file: $JOHN/alnum.chr

That's when using --incremental=alnum, but happens with any method. Why does this happens? Which are the exact modifications or parameters to support 62 characters?

Thanks in advance.

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The included charset files are based on the default maximum length. You'll need to generate charsets for your target length:

john --pot=rockyou.txt --make-charset=alnum62.chr

Existing files will be overwritten, so you'll probably want to choose a different filename from the default.

More in this thread.

  • and .... when I run the custom charset, it will use the words in rockyou.txt? Or the characters? – Megver83 Sep 13 '17 at 22:33
  • Well, it's generating Markov stats by analyzing the combinations of characters in the list. So it's a little of both. :) – Royce Williams Sep 14 '17 at 0:13
  • and what if I do john --stdout --incremental=MODE | john --pot=- --make-charset=alnum62.chr I put --pot=- but how would it be? – Megver83 Sep 14 '17 at 0:27

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