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Fine Example Of Virgenere Encryption

Description
This JavaScript is a fine example of the classic virgenere script and is nearly impossible to decode, even when using frequency analysis. This script is also entertaining since you can actually see the encryption taking place....View A Script Demo


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Java Scripts Magic can do all the hard work for you all At The Touch Of A Button.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
<META NAME="Generator" CONTENT="TextPad 4.4">
<LINK href="general.css" rel="stylesheet" type="text/css">
<SCRIPT LANGUAGE="JavaScript">
<!-- Original:  Francisco Ryan Tolmasky (iopossum@mailcity.com) -->
<!-- Web Site:  http://iopossum.tripod.com -->




<!-- Begin
var TID = 0;
var longer = 0;
var thirdwrite = "";
var alphabet = new Array("0@","1#","2$","3%","4^","5&","6*","7 = ","8-","9+","Aa","Bb","Cc","Dd","Ee","Ff","Gg","Hh","Ii","Jj","Kk","Ll","Mm","Nn","Oo","Pp","Qq","Rr","Ss","Tt","Uu","Vv","Ww","Xx","Yy","Zz");
function preTime(coco, uinput, question) {
longer = coco.length - 1;
placement = 0;
ref = 0 ;
secondWrite = "";
firstWrite = "";
thirdWrite = "";
code1(coco, uinput, longer, question);
}
function findshift(letter) {
for (i = 0; i < 36; i++) {
if ((alphabet[i].substring(0,1) == letter) || (alphabet[i].substring(1,2) == letter)) {
if (alphabet[i].substring(0,1) == letter) {
x = 0;
}
if (alphabet[i].substring(1,2) == letter) {
x = 1;
}
return i;
      }
   }
}
function check(letter) {
bill = "no";
for (i = 0; i < 36; i++) {
if ((alphabet[i].substring(0,1) == letter) || (alphabet[i].substring(1,2) == letter)) {
bill = "yes";
   }
}
if (bill == "yes") {
return true;
}
else {
return false;
   }
}
function fixoffset(takin) {
if (takin > 35) {
return (takin - 36);
}
else {
return takin;
   }
}
function code1(inval1,inval2,inval3,sage) {
if (check(inval2.charAt(placement))) {
if (check(inval1.charAt(ref))) {
if (sage == 0) {
shift = findshift(inval1.charAt(ref));
}
if (sage == 1) {
shift = 36 - findshift(inval1.charAt(ref));
   }
}
else {
shift = 0;
}
orig = findshift(inval2.charAt(placement));
firstWrite = firstWrite+alphabet[fixoffset(orig+shift)].charAt(x);
}
else {
firstWrite = firstWrite+inval2.charAt(placement);
}
secondWrite = inval2.substring(placement+1,inval2.length+1);
thirdWrite = firstWrite+secondWrite;
document.inputo.written.value = thirdWrite;
placement++;
if (ref == inval3) {
ref = 0
}
else {
ref++;
}
if (placement == (inval2.length)) {
window.clearTimeout(TID);
return false;
}
one = inval1;
two = inval2;
three = inval3;
goer = sage;
TID = window.setTimeout("code1(one, two, three, goer)", 0);
}
//  End -->
</script>

</HEAD>

<BODY Background=../graphics/grayback.jpg>
<center><BR><BR><BR>
<form name="inputo">
<textarea name=written rows=12 cols=40>Type message to encode here</textarea>
<br>
Code Phrase:<input type=text name=codeWord value="code phrase here">
<input type=button value="Encode" onClick="preTime(codeWord.value,written.value, 0);">
<input type=button value="Decode" onClick="preTime(codeWord.value,written.value, 1);">
</form>

</center>
</BODY>
</HTML>

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