Hi
I want to encrypt the query string appearing in the URL of a web page,
how to do this

for eg..
I have a Hyperlink column in GridView ,, when I click that column, I pass two parameters ,
these parameters should not be displayed in the URL ,,
It should be in encrypted form with some other numbers …

Any idea how to perform this

Hi  winniecherian,

winniecherian:

Hi
I want to encrypt the query string appearing in the URL of a web page,
how to do this

may have a look at this article. The source is available and easy understandable. Only .NET classes are used. Try it.

 

If you need to keep the data secure, a query string perhaps isn't the safest method to use - there are other ways of passing data between pages.

However, if you need to do it that way, here's an example of how to encrypt and decrypt a string that I got from
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemSecurityCryptography.asp

I've pulled out a few bits which weren't relevant, see the URL above for the full example 

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;

namespace RC2CryptoServiceProvider_Examples
{
    class MyMainClass
    {
        public static void Main()
        {
            string original = "This is a much longer string of data than a public/private key algorithm will accept.";
            string roundtrip;
            ASCIIEncoding textConverter = new ASCIIEncoding();
            RC2CryptoServiceProvider rc2CSP = new RC2CryptoServiceProvider();
            byte[] fromEncrypt;
            byte[] encrypted;
            byte[] toEncrypt;
            byte[] key;
            byte[] IV;

            //Create a new key and initialization vector.
            rc2CSP.GenerateKey(); // You'll probably want to do this once, save it and use it in the sending and receiving pages
            rc2CSP.GenerateIV();

            //Get the key and IV.
            key = rc2CSP.Key;
            IV = rc2CSP.IV;

            //Get an encryptor.
            ICryptoTransform encryptor = rc2CSP.CreateEncryptor(key, IV);
            
            //Encrypt the data.
            MemoryStream msEncrypt = new MemoryStream();
            CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);

            //Convert the data to a byte array.
            toEncrypt = textConverter.GetBytes(original);

            //Write all data to the crypto stream and flush it.
            csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
            csEncrypt.FlushFinalBlock();

            //Get encrypted array of bytes.
            encrypted = msEncrypt.ToArray();
	   // You can convert this to a string, HttpUtility.UrlEncode it and use it in your querystring - you'll have to do the reverse to decrypt

	   // You'll need code like this in your receving page to decrypt - you'll have to store the key somewhere in order to pass it
           // between the two pages
           //Get a decryptor that uses the same key and IV as the encryptor.
           ICryptoTransform decryptor = rc2CSP.CreateDecryptor(key, IV);

            //Now decrypt the previously encrypted message using the decryptor
            // obtained in the above step.
            MemoryStream msDecrypt = new MemoryStream(encrypted);
            CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);

            fromEncrypt = new byte[encrypted.Length];

            //Read the data out of the crypto stream.
            csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);

            //Convert the byte array back into a string.
            roundtrip = textConverter.GetString(fromEncrypt);
        }
    }
}