In this post I will go through a simple encryption method I’ve done few years ago. It is actually so simple, but I’ve heard that some currently-used encryption algorithms are based on this principle.

Here is the code: (function “ec_t” – encryption method; function “dc_t” – decryption method)

/*
 * Sample encryption and
 * decryption by Artem Los
 * 
 */ 

  //Encrypt
    function ec_t(t, key) {
        var c = "";
        var d = "";
        var _key2 = StringToAsc(key);
        var e = genKey(_key2 , t.length);
        var _keyA =  new String (key.length);

        for (i = 0; i < t.length; i++) {

            var _def_t = eval(t.charCodeAt(i));
            var _def_e = eval(e.charAt(i));
            var _def_a = eval(_keyA.charAt(0));

            c = _def_e + _def_t +_def_a;
            d += String.fromCharCode (c);

        }
        return d;
    }

    function genKey(key, l) {
        var _vectorA = key;
        while (_vectorA.length < l) {
            _vectorA += _vectorA;
        }
        return _vectorA;
    }
    function StringToAsc(text) {
        var _vectorA = "";

        for (i = 0; i < text.length; i++) {
            _vectorA +=  text.charCodeAt(i);
        }
        return _vectorA;
    }

    //Decrypt
    function dc_t(t, key) {
        var c = "";
        var d = "";
        var _key2 = StringToAsc(key);
        var _keyA = new String(key.length);
        var e = genKey(_key2, t.length);

        for (i = 0; i < t.length; i++) {

            c = t.charCodeAt(i) - e.charAt(i) - _keyA.charAt (0);
            d +=  String.fromCharCode (c);
        }
        return d;

    }

    function do_e() {

        var _vecB = unescape (  in01.value);
        var _passA = pass.value;

        if (_passA != "") {
            if (ra01.checked == true) {
                var _vecC = ec_t(_vecB, _passA );
                in02.value = escape ( _vecC);
            }

            else {
                    var _vecC = dc_t(_vecB , _passA);
                    in02.value = _vecC;
            }
        }
    }

If you want to view this code in-work, enter the link below:
Encrypter

Why and how did it work?
The code above works on a simple principle, I discovered it without looking at internet, though! 😛

Say we have a table where all letters have an id, i.e., a number. The table looks as follows: A-1, B-2, C-3 …
First of all, we need to define our message, say we have “BAC” corresponding to “213”.
Then we need a key, say “CBA” – “321”. (it is in the same format as the message).

The result is therefore 435 or DCE. When we decrypt we have to do the same but backwards, using the key, i.e., instead of addition use subtraction.

This is done with function “ec_t” and “dc_t”.
If the message is longer than the key, then we need to duplicate the key so it matches the message length. All that is done in function “getKey”.

It is better that you use function “do_e” instead of “ec_t”, because then all letters will go through a escape function, which means that the text will be more copy-friendly, i.e., easier to copy without missing some letters which can affect the result.

Good luck!

So, today I will show some useful codes that might be used for protecting information with Java Script.

1. First of all, the most common protection method is to disable the right-clicking, i.e. disallow user to copy stuff from a webpage.

   
   /*
    * This script is create by Artem Los
    * Copyright (C) Artem Los, All rights reserved
    * You may use this code in commercial and
    * personal usage. You have no rights to
    * sell this code.
    * NOTE: Author must have credits for this code.
    */

    var r = "True";
    var text = "This site is protected!";

function IE(e) {
    if (navigator.appName == "Microsoft Internet Explorer") {
        if (event.button == "2" || event.button == "3") {
             alert(text);
             return false;
          }
     }
}
function NS(e) {
    if (document.layers || document.getElementById && !document.all) {
        if (e.which == "2" || e.which == "3") {
            alert(text);
        }
        else if (e.which == "1") {
        if (r == "True") { return false; }
        }
    }
    return false;
}

document.onselectstart = new Function('if(r=="True"){return false;}');document.onmousedown = IE;document.onmouseup = NS;document.oncontextmenu = new Function("return false");

So, by using the code above you can be ensured that your information is safe at a basic level. It can still be taken by looking at the source, and copying it therefrom.
I will try to publish another code that actually protects the whole website, but remember that even though you got your page encrypted, it might still be cracked. Like with all kinds of protections, it is all about the time!

2. Another tip that I will talk about is links. It is so often that robots takes the, for instance, email address, and use it for spamming. However, we may solve this issue! Here I’ve got to methods that may help you to protect your links.

 /*
    * This script is create by Artem Los
    * Copyright (C) Artem Los, All rights reserved
    * You may use this code in commercial and
    * personal usage. You have no rights to
    * sell this code.
    * NOTE: Author must have credits for this code.
    */

    var AllLinks = new Array();
    AllLinks[0] = "http://www.clizware.net/";
function email(x) {

    if (x != "" || "undefined") {
        window.location = AllLinks [x];
        var a = document.getElementById("elink" + x);

    }
    else {
        alert("This link does not exist!");
    }

In the body of the page, enter:

<a href ="#" onclick ="email(0);" id="elink1">Link</a>

To improve this code, you can for example encrypt the link. I would recommend the escape/unescape function, but It actually does not matter. Once again, it’s all about the time.

The second method is not so useful, though. It is only working in Internet Explorer, and it have actually now function, just to hide the status bar.

   /*
    * This script is create by Artem Los
    * Copyright (C) Artem Los, All rights reserved
    * You may use this code in commercial and
    * personal usage. You have no rights to
    * sell this code.
    * NOTE: Author must have credits for this code.
    */

    window.defaultStatus = "All links are protected";

This tutorial will show you how you can encrypt/decrypt text (string) with Java Script or JScript.

First we need a table, even called for matrix. To create a matrix I chose to combine three array-lists into one single. (Note that it also works without the combining of arrays!)

        //generating 3 arrays
        var _matrixA = new Array();
        var _matrixB = new Array();
        var _matrixC = new Array();
        var _mA, _mB;

        _matrixA = new Array("A", "", "", "B", "C", "D", "E", "F", "G", "H");   // 0
        _matrixB = new Array("I", "J", "K", "L", "M", "N", "O", "P", "Q", "R"); // 1
        _matrixC = new Array("S", "T", "U", "V", "W", "X", "Y", "Z", ".", "/"); // 2

        //assign values of columns
        _mA = 1;
        _mB = 2;

        //combining matrix
        var _matrix = new Array(_matrixA, _matrixB, _matrixC); //this is the table, to get data, use _matrix[x][y]

Encryption Method:

        // Encryption method
        function encrypt(_text) {
        	var _returnVal = "";
            for (i = 0; i < _text.length; i++) {

                if (_matrixA.indexOf(_text.charAt(i)) != -1) {

                    _returnVal += (_matrixA.indexOf(_text.charAt(i)));

                }
                if (_matrixB.indexOf(_text.charAt(i)) != -1) {
                    _returnVal += (_mA); //default 1
                    _returnVal += (_matrixB.indexOf(_text.charAt(i)));

                }
                if (_matrixC.indexOf(_text.charAt(i)) != -1) {
                    _returnVal += (_mB); //default 2
                    _returnVal += (_matrixC.indexOf(_text.charAt(i)));

                }

            }
            return _returnVal;

        }

Decryption Method:

        // Decryption Method
        function decrypt(_text)
        {
        	var _returnVal = "";
        	for (i=0; i < _text.length; i++)
        	{
        		if (_text.charAt(i) != _mA || _text.charAt(i) != _mB )//the char has to be in 'first' matrix, _matrixA
        		{
        			_returnVal += _matrixA[_text.charAt(i)];
        		}

        		if (_text.charAt(i) == _mA) //the char has to be in 'secend' matrix, _matrixB
        		{
        			i++;
        			_returnVal += _matrixB[_text.charAt(i)];
        		}

        		if (_text.charAt(i) == _mB) //the char has to be in 'third' matrix, _matrixC
        		{
        			i++;
        			_returnVal += _matrixC[_text.charAt(i)];
        		}

        	}

        	return _returnVal;
        }

Copyright (C) 2011 Artem Los