using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static void Main()

    {

    }

​

    public static string Encrypt(string clearText)

    {

      string password = "A_Wise_Man_Once_Told_Me_Obfuscation_Is_Useless_Anyway";

      byte[] bytes = Encoding.get_Unicode().GetBytes(clearText);

      using (Aes aes = Aes.Create())

      {

        Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, new byte[13]

        {

          (byte) 73,

          (byte) 118,

          (byte) 97,

          (byte) 110,

          (byte) 32,

          (byte) 77,

          (byte) 101,

          (byte) 100,

          (byte) 118,

          (byte) 101,

          (byte) 100,

          (byte) 101,

          (byte) 118

        });

        aes.Key = rfc2898DeriveBytes.GetBytes(32);

        aes.IV = rfc2898DeriveBytes.GetBytes(16);

        using (MemoryStream memoryStream = new MemoryStream())

        {

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

          {

            ((Stream) cryptoStream).Write(bytes, 0, bytes.Length);

            ((Stream) cryptoStream).Close();

          }

          clearText = Convert.ToBase64String(memoryStream.ToArray());

        }

      }

      return clearText;

    }

​

    public static string Decrypt(string cipherText)

    {

      string password = "A_Wise_Man_Once_Told_Me_Obfuscation_Is_Useless_Anyway";

      cipherText = cipherText.Replace(" ", "+");

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

      using (Aes aes = Aes.Create())

      {

        Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes(password, new byte[13]

        {

          (byte) 73,

          (byte) 118,

          (byte) 97,

          (byte) 110,

          (byte) 32,

          (byte) 77,

          (byte) 101,

          (byte) 100,

          (byte) 118,

          (byte) 101,

          (byte) 100,

          (byte) 101,

          (byte) 118

        });

        aes.Key = rfc2898DeriveBytes.GetBytes(32);

        aes.IV = rfc2898DeriveBytes.GetBytes(16);

        using (MemoryStream memoryStream = new MemoryStream())

        {

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

          {

            ((Stream) cryptoStream).Write(numArray, 0, numArray.Length);

            ((Stream) cryptoStream).Close();

          }

          cipherText = Encoding.get_Unicode().GetString(memoryStream.ToArray());

        }

      }

      return cipherText;

    }

  }

}

​