Introduction:

In this article we are going to explain how to Encrypt and Decrypt website URL or Email Address in Asp.net with example.

Description:

Encrypt and decrypt are very important data in asp.net For security purpose, we are storing some valuable things in Encrypt format.

Let’s see an example:

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;



namespace TutorialsAsp.Net

{

    public partial class Default : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {



        }



        public string Encrypt(string inputText)

        {

            string encryptionkey = "ACDS193BX628TD57";

            byte[] keybytes = Encoding.ASCII.GetBytes(encryptionkey.Length.ToString());

            RijndaelManaged rijndaelCipher = new RijndaelManaged();

            byte[] plainText = Encoding.Unicode.GetBytes(inputText);

            PasswordDeriveBytes pwdbytes = new PasswordDeriveBytes(encryptionkey, keybytes);

            using (ICryptoTransform encryptrans = rijndaelCipher.CreateEncryptor(pwdbytes.GetBytes(32), pwdbytes.GetBytes(16)))

            {

                using (MemoryStream mstrm = new MemoryStream())

                {

                    using (CryptoStream cryptstm = new CryptoStream(mstrm, encryptrans, CryptoStreamMode.Write))

                    {

                        cryptstm.Write(plainText, 0, plainText.Length);

                        cryptstm.Close();

                        return Convert.ToBase64String(mstrm.ToArray());

                    } 
                } 
            } 
        } 
        public string Decrypt(string encryptText) 
        { 
            string encryptionkey = "ACDS193BX628TD57"; 
            byte[] keybytes = Encoding.ASCII.GetBytes(encryptionkey.Length.ToString()); 
            RijndaelManaged rijndaelCipher = new RijndaelManaged(); 
            byte[] encryptedData = Convert.FromBase64String(encryptText.Replace(" ", "+")); 
            PasswordDeriveBytes pwdbytes = new PasswordDeriveBytes(encryptionkey, keybytes); 
            using (ICryptoTransform decryptrans = rijndaelCipher.CreateDecryptor(pwdbytes.GetBytes(32), pwdbytes.GetBytes(16))) 
            { 
                using (MemoryStream mstrm = new MemoryStream(encryptedData)) 
                { 
                    using (CryptoStream cryptstm = new CryptoStream(mstrm, decryptrans, CryptoStreamMode.Read)) 
                    { 
                        byte[] plainText = new byte[encryptedData.Length]; 
                        int decryptedCount = cryptstm.Read(plainText, 0, plainText.Length); 
                        return Encoding.Unicode.GetString(plainText, 0, decryptedCount); 
                    } 
                } 
            } 
        } 

        protected void btnEncrypt_Click(object sender, EventArgs e) 
        { 
            lblEncrypt.Text = Encrypt(txtEncrypt.Text); 
        } 

        protected void btnDecrypt_Click(object sender, EventArgs e) 
        { 
            lblDecrypt.Text = Decrypt(txtDecrypt.Text); 
        } 

    } 
} 

Output:

 I hope this article will help to you after reading.