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Secure Crypt - PHP Code Bank

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Secure Crypt
Simple yet hard to break encryption that uses a pass to safly encrypt text files or scripts, supports all known chars. can only be decrypted using the right key, i did try to do some smart brute force but so far no luck with breaking it without the pass :) you may find better/faster ways to rewrite the code, but at least it works ...... 
                php script:
///////////////////
<?php
if($_POST['task']!="" and $_POST['message']!="")
{
$message=$_POST['message'];
if($_POST['key']!="")
{
$key=md5($_POST['key']);
}
else
{
$key=md5('Long Text To Be Used As Default Key');
}
$array_key=str_split($key,1);
$array_final_key=array_unique($array_key);
foreach($array_final_key as $single_key)
{
$master_key[]=$single_key;
}
$counter_key=count($master_key);
if($_POST['task']!='decrypt')
{
// Encrypt
$message_array=str_split($message,$counter_key);
foreach($message_array as $chunk)
{
$single_char_value=str_split($chunk,1);
for($loop1=0;$loop1<$counter_key;$loop1++)
{
$ord_sum_char[]=ord($master_key[$loop1])+ord($single_char_value[$loop1]);
}
}
foreach($ord_sum_char as $to_encrypt)
{
$loop_val=intval($to_encrypt/11);
$mod_val=$to_encrypt%11;
switch($mod_val)
{
case "0";
$char_fixed_val='<';
break;
case "1";
$char_fixed_val='*';
break;
case "2";
$char_fixed_val='$';
break;
case "3";
$char_fixed_val='#';
break;
case "4";
$char_fixed_val='+';
break;
case "5";
$char_fixed_val='?';
break;
case "6";
$char_fixed_val='>';
break;
case "7";
$char_fixed_val='^';
break;
case "8";
$char_fixed_val='!';
break;
case "9";
$char_fixed_val='&';
break;
case "10";
$char_fixed_val='%';
break;
}
$encryptd_char[]=$loop_val.$char_fixed_val;
}
$final_message=implode(" ",$encryptd_char);
echo'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>
Super Crypt By ADIGA
</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="main_container">
<div id="body_container">
<div id="header">Super Crypt</div>
<form method="post" action="index.php">
<textarea name="message" id="text_area">'.$final_message.'</textarea>
<select name="task" id="task">
<option value="encrypt">Encrypt Text</option>
<option value="decrypt">Decrypt Text</option>
</select>
<input type="submit" value="Encrypt/Decrypt" id="button">
<div id="key">Key&nbsp;:</div>
<input type="text" name="key" id="key_text">
</form>
</div>
</div>
</body>
</html>';
}
else
{
// Decrypt
$first_decrypt_array=explode(" ",$message);
$counter_element=0;
$text_reset="";
foreach($first_decrypt_array as $first_value)
{
$counter_element=$counter_element+1;
if($counter_element%$counter_key=="0")
{
$text_reset=$text_reset.$first_value."Q";
}
else
{
$text_reset=$text_reset.$first_value." ";
}
}
$text_fixed=rtrim($text_reset,"Q");
$array_sectors=explode("Q",$text_fixed);
foreach($array_sectors as $sector)
{
$array_chars_fixed=explode(" ",$sector);
$counter_chars_fixed=count($array_chars_fixed);
for($loop_fixed=0;$loop_fixed<$counter_chars_fixed;$loop_fixed++)
{
$char_single_fixed=substr($array_chars_fixed[$loop_fixed],-1);
$loops_fixed=str_replace($char_single_fixed,"",$array_chars_fixed[$loop_fixed]);
$loops_fixed_val=$loops_fixed*11;
switch($char_single_fixed)
{
case "<";
$char_fixed_val=0;
break;
case "*";
$char_fixed_val=1;
break;
case "$";
$char_fixed_val=2;
break;
case "#";
$char_fixed_val=3;
break;
case "+";
$char_fixed_val=4;
break;
case "?";
$char_fixed_val=5;
break;
case ">";
$char_fixed_val=6;
break;
case "^";
$char_fixed_val=7;
break;
case "!";
$char_fixed_val=8;
break;
case "&";
$char_fixed_val=9;
break;
case "%";
$char_fixed_val=10;
break;
}
$final_val=($loops_fixed_val+$char_fixed_val)-ord($master_key[$loop_fixed]);
if($final_val!=0)
{
$decoded_message[]=chr($final_val);
}
}
}
$final_message1=implode("",$decoded_message);
$fh=fopen("Decoded.txt","w+");
fputs($fh,$final_message1);
fclose($fh);
echo'<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>
Super Crypt By ADIGA
</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="main_container">
<div id="body_container">
<div id="header"><a href="Decoded.txt">Decoded Message</a></div>
</div>
</div>
</body>
</html>';
}
}
else
{
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>
Super Crypt By ADIGA
</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<div id="main_container">
<div id="body_container">
<div id="header">Super Crypt</div>
<form method="post" action="index.php">
<textarea name="message" id="text_area"></textarea>
<select name="task" id="task">
<option value="encrypt">Encrypt Text</option>
<option value="decrypt">Decrypt Text</option>
</select>
<input type="submit" value="Encrypt/Decrypt" id="button">
<div id="key">Key&nbsp;:</div>
<input type="text" name="key" id="key_text">
</form>
</div>
</div>
</body>
</html>';
}
?>
///////////////////
style file (style.css)
///////////////////
html{
cursor: default;
}
body{
margin: 0px;
font-size: 14px;
color: #ff0000;
font-weight: bold;
background: #000000;
}
#main_container{
width: 500px;
margin-left: auto;
margin-right: auto;
}
#body_container{
width: 500px;
height: 600px;
position: relative;
top: 0px;
left: 0px;
}
#header{
height: 50px;
width: 498px;
background: #000000;
position: absolute;
top: 100px;
left: 0px;
padding-top: 5px;
padding-left: 0px;
padding-right: 0px;
padding-bottom: 0px;
font-size: 32px;
color: #ff0000;
text-align: center;
border: 1px solid #ff0000; 
}
#text_area{
height: 300px;
width: 500px;
border: 0px;
background: #ff0000;
position: absolute;
top: 160px;
left: 0px;
cursor: default;
font-size: 14px;
font-weight: bold;
}
#task{
width: 110px;
position: absolute;
top: 470px;
left: 0px;
background: #ff0000;
border: 0px; 
}
#button{
width: 110px;
position: absolute;
top: 470px;
left: 120px;
background: #ff0000;
border: 0px;
}
#key{
position: absolute;
top: 470px;
left: 255px;
}
#key_text{
width: 200px;
background: #ff0000;
position: absolute;
top: 470px;
right: 0px;
border: 0px;
}
ADIGA avatarADIGA
Comments
ghost's avatar
ghost 13 years ago

While I do like the method you went about creating your own encryption/decryption script, there are multiple places where you can make it more efficient (as you have said in your description). I understand what you are doing just messing around with it though (instead of focusing on efficiency) which is totally fine and good :-).

I do question, however, your use of "array_unique". Why would you want to do that? Because of that, any key of "abc" will also encrypt/decrypt the same as "aaaabbbbccccc" (at least according to my reading of your script…I haven't actually run it). Is there a reason you added that line? I'd like to know.

ADIGA's avatar
ADIGA 13 years ago

the key it self is not used directly, its the unique chars in its md5. md5(abc) != md5(aaaabbbccc).

the idea is to make the number of chars used to encrypt the text harder to guess.