Dictionnary cracker in Ruby and Python

This did not seem to interest anyone on LNO, so since you guys are much more friendly, you will probably have something to say.

Python:

#!/usr/bin/env python

import sys, crypt

if len(sys.argv) < 3:
 print "Usage: %s <encrypted string> <dict file>" % sys.argv[0]
 sys.exit(1)

secret = sys.argv[1]
saltstring = secret[:2]
f = open(sys.argv[2])
guess = None
word = None

while word != "":

 word = f.readline()
 guess = crypt.crypt(word, saltstring)
 if guess == secret:
  print "The password is:", word
  sys.exit(0)

print "Could not find password in file", sys.argv[2]

Ruby:

#!/usr/bin/env ruby

if ARGV.size < 2
 puts "Usage: #{$0} <crypted string> <dict file>"
 exit 1
end

secret = ARGV[0]
saltstring = secret[0,2]
f = File.open(ARGV[1])

f.each_line do |x|
 if x.crypt(saltstring) == secret
  puts "The password is: #{x}"
  exit
  end
end
puts "No password found in #{ARGV[1]}"

This is a very basic implementation. I am planning to implement things like playing with the case of the word.

Hint: These two programs could prove to be extremely useful if you are taking part of the www.hackerslab.org contest.

[kenshi]

Those are pretty interesting. By the way, what programs use crypt for password encryption?

Old Unix boxes and little programs who need simple encryption.

[flynnwallace]

I saw it when you posted on linuxnewbie.org and its a nice little piece of code. Unfortunately I cant really understand the meat of it because I have never used python. I know mostly c++ so I have a basic idea of how your programs works.

I've got a simpler version of the Python version now. I'll post it tonight when I get home.