<?php;;$key = "This is supposed to be a secret key !!!";;;function keyED($txt,$encrypt_key);;{;;$encrypt_key = md5($encrypt_key);;;$ctr=0;;;$tmp = "";;;for ($i=0;$i<strlen($txt);$i++);;{;;if ($ctr==strlen($encrypt_key)) $ctr=0;;;$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);;;$ctr++;;;};;return $tmp;;;};;function encrypt($txt,$key);;{;;srand((double)microtime()*1000000);;;$encrypt_key = md5(rand(0,32000));;;$ctr=0;;;$tmp = "";;;for ($i=0;$i<strlen($txt);$i++);;{;;if ($ctr==strlen($encrypt_key)) $ctr=0;;;$tmp.= substr($encrypt_key,$ctr,1) .;;(substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));;;$ctr++;;;};;return keyED($tmp,$key);;;};;function decrypt($txt,$key);;{;;$txt = keyED($txt,$key);;;$tmp = "";;;for ($i=0;$i<strlen($txt);$i++);;{;;$md5 = substr($txt,$i,1);;;$i++;;;$tmp.= (substr($txt,$i,1) ^ $md5);;;};;return $tmp;;;};;$string = "Hello World !!!";;;// encrypt $string, and store it in $enc_text;;$enc_text = encrypt($string,$key);;;// decrypt the encrypted text $enc_text, and store it in $dec_text;;$dec_text = decrypt($enc_text,$key);;;print "Original text : $string <Br>n";;;print "Encrypted text : $enc_text <Br>n";;;print "Decrypted text : $dec_text <Br>n";;;?>;;