using System;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Encrypt");

        var data = "Amanda";

        var encryptData = Cryptography.Crypt(data);

        Console.WriteLine(encryptData);

        Console.WriteLine("Decrypt");       

        var result = Cryptography.Decrypt(encryptData);

        Console.WriteLine(result);

    }

}

​

    public static class Cryptography

    {

        readonly static string Key;

​

        static Cryptography() {

            Key = "CrptographyKey";

        }

​

        static TripleDES CreateDES()

        {

            MD5 md5 = new MD5CryptoServiceProvider();

            TripleDES des = new TripleDESCryptoServiceProvider();

            des.Key = md5.ComputeHash(Encoding.Unicode.GetBytes(Key));

            des.IV = new byte[des.BlockSize / 8];

            return des;

        }

​

        public static string Crypt(string PlainText)

        {

            TripleDES des = CreateDES();

            ICryptoTransform ct = des.CreateEncryptor();

            byte[] input = Encoding.Unicode.GetBytes(PlainText);

            byte[] output = ct.TransformFinalBlock(input, 0, input.Length);

            return Convert.ToBase64String(output);

        }

​

​

        public static string Decrypt(string CypherText)

        {

            byte[] b = Convert.FromBase64String(CypherText);

            TripleDES des = CreateDES();

            ICryptoTransform ct = des.CreateDecryptor();

            byte[] output = ct.TransformFinalBlock(b, 0, b.Length);

            return Encoding.Unicode.GetString(output);

        }

    }