Pastable version of brute-force password cracker

<pre class='prettyprint' language='ruby'>#!/bin/ruby

characters_to_use=&quot;ABCD&quot;
minimum_password_length=5
maximum_password_length=15

def password_correct?(test_password)
# This is just for testing. There's no need to alter this bit!
  return true if test_password == &quot;DCBAAAA&quot;
  return false
end

char_array=characters_to_use.split(//)
is_access_granted = false

(minimum_password_length..maximum_password_length).each do |password_length|  # loop to gradually increase password length
  combinations=char_array.length**password_length

(0..combinations-1).each do |perm_number| # loop through combinations for a given length
    password=&quot;&quot;
    (1..password_length).each do |char_number| # loop through characters
      char_reference = (perm_number / char_array.length**(char_number-1)).floor % char_array.length
      character = char_array[char_reference]
      password &lt;&lt; character
    end

if password_correct?(password)
     puts &quot;#{password} | Access Denied | #{perm_number} / #{combinations}&quot;
    else
      puts &quot;#{password} | Access Granted&quot;
      is_access_granted = true
      break
    end
  end
  break if is_access_granted
end</pre>
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Pastable version of brute-force password cracker