John the Ripper

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Installer et lancer

Installer John

$sudo apt-get install john

Préparer le fichier

$sudo unshadow /etc/passwd /etc/shadow > mypasswd

Lancer la recherche de mots de passe

$sudo john mypasswd

Afficher les résultats

$sudo john –show mypasswd

Ajouter des dictionnaires

=Optimiser la recherche pour Ubuntu

Remplacer sha512 par md5 dans common-password:

# here are the per-package modules (the "Primary" block)
password        [success=1 default=ignore] obscure sha512

# here are the per-package modules (the "Primary" block)
password        [success=1 default=ignore] obscure md5

Afficher l'avancement

$sudo john --status

While John the Ripper is running, press any key (like enter) to see a status output. Or to check from another terminal you can run john --status. The output looks like this:

DES cracking speed: 94g 0:01:08:34 74% 2/3 0.02284g/s 2784p/s 97648c/s 269491C/s day?..Hal?
1                   2   3          4   5   6          7       8        9         10

Here is what each section means:

  1. Type of encryption it is trying to crack with
  2. Number of successful password guesses
  3. Time elapsed since started
  4. Percent completed for that pass
  5. Current pass / number of passes total
  6. g/s = successful guesses per second
  7. p/s = passwords tested per second
  8. c/s = crypts (password hashes) computed per second
  9. C/s = crypts tested per second (in versions below 1.8.0 this was “c/s”)
  10. The current word it’s trying.