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Password Protect >>> Xor Encryption.

Performs a bitwise XOR (Exclusive Or) on each byte of the data you wish to encrypt using the key you provide. Useful as an additional security precaution when sending sensitive information over the Internet. (However, this method is not foolproof and should not be your only form of security.) The author notes that longer and more random keys increase the strength of the encryption.


... using password:

Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
var allowedChars = " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~??┌?└┘├┤€┴?▀?????▒▓⌠■∙√≈?™?⌡???? ???¤?¦§?©?«­╜®?°±???µ╤·???»????????????????????????????????????????????????????????????????????";
function CharToDec(Character) {
var pos = allowedChars.indexOf(Character.charAt(0));
if(pos == -1) {
window.status += Character;
pos = 0;
}
return pos;
}
function DecToBin(Decimal) {
var i = 0;
var Bin = "";
while(Decimal > Math.pow(2, i)) {
i++;
}
for (var i = i; i >= 0; i--) {
if (Decimal >= Math.pow(2, i)) {
Decimal -= Math.pow(2, i);
Bin += "1";
}
else Bin += "0";
}
return Bin;
}
function ExclusiveOr(input1, input2) {
var output = "";
while(input1.length < input2.length) {
input1 = "0" + input1;
}
while(input1.length > input2.length) {
input2 = "0" + input2;
}
if (input1.length == input2.length) {
for (var i=0; i<input1.length; i++) {
output += (input1.charAt(i) != input2.charAt(i)) ? "1" : "0";
}
}
else alert("XOR Operation Error.");
return output;
}
function BinToDec(Binary) {
var Dec = 0;
for(var i=0; i<=Binary.length; i++) {
Dec += Math.pow(2,i) * Binary.charAt((Binary.length - 1) - i);
}
return Dec;
}
function DecToChar(Decimal) {
if (Decimal > allowedChars.length) {
Decimal = 0;
}
var pos = allowedChars.charAt(Decimal);
return pos;
}
function BlockEncrypt(input1, input2) {
var output = "";
if (input1.length == input2.length) {
for (var i = 0; i < input1.length; i++) {
output += DecToChar(BinToDec(ExclusiveOr(DecToBin(CharToDec(input1.charAt(i))), DecToBin(CharToDec(input2.charAt(i))))));
   }
}
else alert("Block Encryption Error.");
return output;
}

/*   Function:  Encrypts data.
   Parameters:  2 parameters:  (text string, key)
      Returns:  Encrypted string

Decrypt the string by running function twice.
*/
function EncryptString(plainText, key) {
var cipherText = "";
var textBlock, keyBlock = "";
var keyRotationPos = 0;
var beforePos, afterPos = 0;
var blockSize = 48;
var key = hashKey(key);
while(afterPos < plainText.length) {
beforePos = 0;
afterPos = blockSize;
if(afterPos < plainText.length) {
afterPos = plainText.length;
}
textBlock = plainText.substring(beforePos, afterPos);
keyBlock = key.substring(keyRotationPos, key.length);
while(keyBlock.length < textBlock.length) {
keyBlock += key;
}
keyBlock = keyBlock.substring(0, textBlock.length);
keyRotationPos = keyBlock.length % key.length;
cipherText += BlockEncrypt(textBlock, keyBlock);
beforePos = afterPos;
afterPos += blockSize;
}
return cipherText;
}
function hashKey(key) {
var hash = "";
for (var i = 0; i < key.length; i++) {
hash += DecToChar((CharToDec(key.charAt(i)) + i) % allowedChars.length);
}
return hash;
}
//  End -->
</script>
<center>
<form name=box>
<table cellpadding=0 cellspacing=0 border=0>
<tr>
<td
colspan=3>
<textarea wrap=soft cols=40 rows=5 wrap=virtual name=ipt></textarea>
</td>
</tr>
<tr
height=50>
<td
align=center>
<input type=button onclick="document.box.ipt.value=EncryptString(document.box.ipt.value,document.box.pwd.value);" value="Encrypt / Decrypt"><br>
... using password:  <input type=text name=pwd value="password">
</td>
</tr>
</table>
</form>
</center>

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