$encrypted = md5( sha1( 'some string' ) );

function wildhoney_encrypt($szString)
{
    $szEncrypted = '';
    $aParts = str_split($szString, 1);
    
    foreach($aParts as $szLetter)
    {
        $szEncrypted .= chr(ord($szLetter) + 5);
    }
    
    return $szEncrypted;
}

function wildhoney_decrypt($szString)
{
    $szDecrypted = '';
    $aParts = str_split($szString, 1);
    
    foreach($aParts as $szLetter)
    {
        $szDecrypted .= chr(ord($szLetter) - 5);
    }
    
    return $szDecrypted;
}

$szString = 'Bleh';
$szEncrypted = wildhoney_encrypt($szString);
$szDecrypted = wildhoney_decrypt($szEncrypted);

echo 'Encrypted: ' . $szEncrypted . '<br />';
echo 'Decrypted: ' . $szDecrypted;