Talk In Code

Disemvoweling is a technique used on blogs and forums to censor any post or comment that contains spam or other unwanted text. It involves simply removing the vowels from the text so that it is almost, but not entirely, unreadable.

Use the following function to disemvowel a string of text.

function disemvowel($string)
{
    return str_replace(array('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'), '', $string);
}

As an example, the first sentence on this post:

Disemvoweling is a technique used on blogs and forums to censor any post or comment that contains spam or other unwanted text.

would appear like this:

Dsmvwlng s tchnq sd n blgs nd frms t cnsr ny pst r cmmnt tht cntns spm r thr nwntd txt.

Which doesn’t make a lot of sense, but is still kind of readable. This technique kills unwanted comments without removing the text entirely.

Check out the Wikipedia page on Disemvoweling for more information on the origins or this method.

I have talked about generating random passwords before. Although that function generated some nice passwords, they perhaps aren’t as unique as they ought to be.

This function, take from Webtoolkit creates passwords of different length with varying levels of complexity.

function generatePassword($length=9, $strength=0) {
  $vowels = 'aeiu';
  $consonants = 'bdghjmnpqrstvxyz';
  if ( $strength & 1 ) {
    $consonants .= 'BDGHJLMNPQRSTVWXYZ';
  }
  if ( $strength & 2 ) {
    $vowels .= 'AEU';
  }
  if ( $strength & 4 ) {
    $consonants .= '23456789';
  }
  if ( $strength & 8 ) {
    $consonants .= '@#$%';
  }
 
  $password = '';
  $alt = time() % 2;
  for ($i = 0; $i < $length; $i++) {
    if ($alt == 1) {
      $password .= $consonants[(rand() % strlen($consonants))];
      $alt = 0;
    } else {
      $password .= $vowels[(rand() % strlen($vowels))];
      $alt = 1;
    }
  }
  return $password;
}

The first parameter is the number of characters that the function should return. The second parameter is a number up to 8 which converts into complexity. The least complex password consists of only lower case consonants. The most complex password consists of upper and lower case letters,

You might notice that some of the letters and numbers are missing, this is deliberate. When passwords are generated many of the characters can be very similar. Zero can look like an upper case O and I can look like the number one or a lower case L. Removing these letters stops people getting their passwords wrong and having to reapply for them in the future. Also, many people write down their passwords, even though you shouldn’t, and in doing this many characters can also look the same. For example, in a mix of upper and lowercase letters it is difficult to see the difference between an upper and lower case W.

You can run the function like this.

echo generatePassword(8,1); // LareSuSy
echo generatePassword(8,2); // hUsuserU
echo generatePassword(8,3); // MEdEgYze
echo generatePassword(8,4); // tanapa3a
echo generatePassword(8,5); // ary2ugeR
echo generatePassword(8,6); // uqUtebyq
echo generatePassword(8,7); // yRysuNEV
echo generatePassword(8,8); // ygyqyha%

This is just the output that I got from these parameters, a different password is run each time. You should be using level 8 for any system administrator passwords.