VBScript - How to make a text encryption program

* This is a simple HTML application which can encrypt and decrypt the text entered into a text box using the given key. The encryption algorithm is really simple and the output is in only uppercase alphabet letters and numbers. The drawback of the program is that it will double the length of the string when encrypting. Don't use this encryption program as the only source of security for important data.
To make the encryption program save the following code with .hta extension using notepad.

<html><head><title>TextEncrypt</title><HTA:APPLICATION   APPLICATIONNAME="TextEncrypt"   ID="TextEncrypt"   VERSION="1.0"   MAXIMIZEBUTTON="no"   SCROLL="no"/></head> <style> body  {background-color: #000000;        color: #808080;}  input  {background-color: #101010;         color: #808080;}  textarea {background-color: #202020;           color: #808080;}  </style> <script language="VBScript"> Sub Window_OnLoad Dim width,height width=460 height=400 self.ResizeTo width,height End Sub  Function Validate(ID) On Error Resume Next Key = Int(pswd.value) If (pswd.value = "") Then X = MsgBox("Enter a password!", 48, "ERROR!") Else If (boxa.value = "") Then X = MsgBox("Enter the text to encrypt or decrypt!", 48, "ERROR!") Else Junk = SetTimeOut(KEYS(ID), 1) End If End If End Function  Function KEYS(ID) text = pswd.value code = 0 Do Until text = "" code = ((Asc(Left(text, 1)))+code) text = Replace(text, Left(text, 1), "", "1", "1") Loop code = code Mod 255 akey.value = code Junk = SetTimeOut(ID, 1) End Function  Function Encrypt Alph = Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L",  "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z") text = boxa.value code = "" key = Int(akey.value) Do Until text = "" cnum = Asc(Left(text, 1)) cnum = (cnum+key) Mod 255 num = cnum Mod 26 count = 0 tst = num Do Until tst = cnum tst = tst+26 count = count+1 Loop code = code & alph(num) & count text = Replace(text, Left(text, 1), "", "1", "1") Loop boxa.value = code End Function  Function Decrypt Alph = Array("A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L",  "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z") text = boxa.value code = "" key = Int(akey.value) Do Until text = "" lttr = Left(text, 2) num = Asc(Left(lttr, 1))-65 chk = Right(lttr, 1) count = 0 Do Until count = Int(chk) num = num+26 count = count+1 Loop num = num-key Do While num <= 0 num = num+255 Loop Code = code & Chr(num) text = Replace(text, Left(text, 2), "", "1", "1") Loop boxa.value = code End Function  </script> <body bgcolor="white"><input type="hidden" id="akey"><table align="center" width="400"><caption><hr><b>TEXT  SECURE</b><hr></caption><tr><td align="center">Password: <input type="password"  id="pswd"></td></tr><tr><td align="center"><input style="width: 410px; height:30px;"  type="button" Value="Encrypt" id="BTNE" onClick="Validate('Encrypt')"  onmouseover="BTNE.style.background='#303030'"  onmouseout="BTNE.style.background='#101010'"></td></tr><tr><td align="center"><input style="width: 410px; height:30px;"  type="button" Value="Decrypt" id="BTND" onClick="Validate('Decrypt')"  onmouseover="BTND.style.background='#303030'"  onmouseout="BTND.style.background='#101010'"></td></tr><tr><td align="center"><textarea id="boxa" cols="50"  rows="10">

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Monday 29 July 2013

VBScript - How to make a text encryption program

VBScript - How to make a text encryption program

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