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XOR Encryption

 
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TRUSTAbyss
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Joined: 29 Oct 2003
Posts: 3752
Location: USA, GA
PostPosted: Thu Jun 09, 2005 2:34 am    Post subject: XOR Encryption Reply with quote
Im creating my own version of PHP Protector and so far Im able to create levels
0 -> 2 , how do I encrypt my version using the PHP XOR Encryption method ?

Example: Level 1 & 2 Protection

this will create a base64/gzdeflated Encrypted string but the problem is that
you can decode this easily if your good at PHP programming , I want to know
if any of you know how to use the XOR Encryption so that I can use it. :-)

Code:

<?php
// String to Encrypt
$string = "Hello, World!"; 

// Compress String (Level 9)
$deflate = gzdeflate($string, 9);

// encode to Base64
$crypt = base64_encode($deflate);

// Decoder string variable
$decode = gzinflate(base64_decode($crypt)); 

// Output Encrypted string
echo "Encrypted: " . $crypt  . "<BR>";

// Output Decoded string
echo "Decrypted: " . $decode;
?>


Sincerely , TRUSTpunk
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aprelium
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Joined: 22 Mar 2002
Posts: 6800
PostPosted: Thu Jun 09, 2005 12:44 pm    Post subject: Re: XOR Encryption Reply with quote
TRUSTpunk,

Well, this is not the exact answer to your question but we suggest spending some time on http://en.wikipedia.org/wiki/Category:Cryptography . It's the best compilation of cryptography algorithms we've found on the Internet and most of the algorithms are explained and sometimes come even with the source code.

What you need here is a symmetric-key encryption algorithm: http://en.wikipedia.org/wiki/Symmetric_key_algorithm .

Most popular symmetric-key algorithms (including AES - IDEA - and the RC family) belong to the Block symmetric encryption algorithms family: http://en.wikipedia.org/wiki/Block_cipher (see the bottom of the page for the listing of the algorithms).
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k1ll3rdr4g0n
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Joined: 04 Jul 2004
Posts: 609
PostPosted: Thu Jun 09, 2005 8:22 pm    Post subject: Reply with quote
TRUSTpunk,

Could you explain what this program is supposed to do?

Because, if I were to goto www.somesite.com/page.php, I wouldn't see the PHP code I would only see the HTML code. Including if I were to view source.

Did you try looking through the PHP online manual at www.php.net for a possible example of XOR?
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AbyssUnderground
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Joined: 31 Dec 2004
Posts: 3855
PostPosted: Thu Jun 09, 2005 8:33 pm    Post subject: Reply with quote
It is supposed to encrypt the PHP code so people cant edit or steal parts of your coding. XOR encryption is one of the most powerful encryption methods around and is one of the hardest to hack.
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Andy (AbyssUnderground) (previously The Inquisitor)
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k1ll3rdr4g0n
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Joined: 04 Jul 2004
Posts: 609
PostPosted: Fri Jun 10, 2005 1:33 am    Post subject: Reply with quote
The Inquisitor wrote:
It is supposed to encrypt the PHP code so people cant edit or steal parts of your coding. XOR encryption is one of the most powerful encryption methods around and is one of the hardest to hack.


I think I know where your going with this, so your php code would be something like this:
Code:

<?
$code = decode("jumbled code kjflksajf;asdjf;j");
exec($code);
?>


Or something like that?
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Arctic
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Joined: 24 Sep 2004
Posts: 560
PostPosted: Fri Jun 10, 2005 1:47 am    Post subject: Reply with quote
The Inquisitor wrote:
It is supposed to encrypt the PHP code so people cant edit or steal parts of your coding. XOR encryption is one of the most powerful encryption methods around and is one of the hardest to hack.


...how do people steal something that can only be seen server-side?
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AbyssUnderground
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Joined: 31 Dec 2004
Posts: 3855
PostPosted: Fri Jun 10, 2005 7:59 am    Post subject: Reply with quote
He means if he creates a script and shares it to people so they can use it. I was going to encrypt my server information script when it was done so people know it is my work and they cant change it.
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Andy (AbyssUnderground) (previously The Inquisitor)
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Arctic
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Joined: 24 Sep 2004
Posts: 560
PostPosted: Fri Jun 10, 2005 1:23 pm    Post subject: Reply with quote
<?php include 'http://yoursite/yourscript.php'; ?>

:P

Anyways, they'd need to install the encoder on their server, like with Invision Power Board trials.
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AbyssUnderground
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Joined: 31 Dec 2004
Posts: 3855
PostPosted: Fri Jun 10, 2005 4:57 pm    Post subject: Reply with quote
No you dont understand, the PHP code itself will be encrypted beyond decryption. Only XOR decryption will be able to show the PHP page as it is normally. Includes has nothing to do with it because the script will be distributed already encoded.

You will see what i mean when TRUSTpunk has finished the script.
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Andy (AbyssUnderground) (previously The Inquisitor)
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Arctic
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Joined: 24 Sep 2004
Posts: 560
PostPosted: Fri Jun 10, 2005 9:27 pm    Post subject: Reply with quote
Oh, you already have the method.. :P
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