using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        // declaring key

        var key = "b14ca5898a4e4133bbce2ea2315a1916";

        // encrypt parameters

        var input = string.Concat("https://myDomain.in/", "Encrypt.aspx?query=", EncryptString(key, string.Format("emailID={0}", "myemail@gmail.com")));

        Console.WriteLine("Encrypted Input: " + input);

        // decrypt parameters

        var decrptedInput = DecryptString(key, input.Substring(input.IndexOf("=") + 1)); 

        Console.WriteLine("Decrypted Input: " + decrptedInput);

    }

​

    public static string EncryptString(string key, string plainInput)

    {

        byte[] iv = new byte[16];

        byte[] array;

        using (Aes aes = Aes.Create())

        {

            aes.Key = Encoding.UTF8.GetBytes(key);

            aes.IV = iv;

            ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);

            using (MemoryStream memoryStream = new MemoryStream())

            {

                using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, encryptor, CryptoStreamMode.Write))

                {

                    using (StreamWriter streamWriter = new StreamWriter((Stream)cryptoStream))

                    {

                        streamWriter.Write(plainInput);

                    }

​

                    array = memoryStream.ToArray();

                }

            }

        }

​

        return Convert.ToBase64String(array);

    }

​

    public static string DecryptString(string key, string cipherText)

    {

        byte[] iv = new byte[16];

        byte[] buffer = Convert.FromBase64String(cipherText);

        using (Aes aes = Aes.Create())

        {

            aes.Key = Encoding.UTF8.GetBytes(key);

            aes.IV = iv;

            ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);

            using (MemoryStream memoryStream = new MemoryStream(buffer))

            {

                using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, decryptor, CryptoStreamMode.Read))

                {

                    using (StreamReader streamReader = new StreamReader((Stream)cryptoStream))

                    {

                        return streamReader.ReadToEnd();

                    }

                }

            }

        }

    }

}