using System;

using System.Security.Cryptography;

using System.Text;

​

​

public class Program

{

    public static void Main()

    {   

        // Simply writes the following text to the standard output

        Console.WriteLine("todecrypt");

        // Reads text until you hit "enter"; and saves it to the "input"-variable

        var input = Console.ReadLine();

        // Writes the "input"-variable to the console.

        Console.WriteLine(CryptoHelper.Decrypt("lCY%2F0v%2BByqAR023zgq2WjtP15Bcim0qu"));

        // The program will not exit until you hit "Enter".

        Console.ReadLine();

    }

​

​

public static class CryptoHelper

    {

        private const string ENCRYPT_KEY = "A4868F33-F599-4F92-ACC5-66CB6E81E0FF";

        public static string Encrypt(string strToEncrypt)

        {

            try

            {

                byte[] byteHash = null;

                byte[] byteBuff = null;

                using (MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider())

                {

                    byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(ENCRYPT_KEY));

                }

                byteBuff = ASCIIEncoding.ASCII.GetBytes(strToEncrypt);

                string strEncrypted = null;

                using (TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider { Key = byteHash, Mode = CipherMode.ECB })

                {

                    strEncrypted = Convert.ToBase64String(objDESCrypto.CreateEncryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length));

                }

                return strEncrypted;

            }

            catch (Exception ex)

            {

                return "Wrong Input. " + ex.Message;

            }

        }

​

        public static string Decrypt(string strEncrypted)

        {

            try

            {

                byte[] byteHash = null;

                byte[] byteBuff = null;

                using (MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider())

                {

                    byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(ENCRYPT_KEY));

                }

                byteBuff = Convert.FromBase64String(strEncrypted);

                string strDecrypted = null;

                using (TripleDESCryptoServiceProvider objDESCrypto = new TripleDESCryptoServiceProvider { Key = byteHash, Mode = CipherMode.ECB })

                {

                    strDecrypted = ASCIIEncoding.ASCII.GetString(objDESCrypto.CreateDecryptor().TransformFinalBlock(byteBuff, 0, byteBuff.Length));

                }

                return strDecrypted;

            }

            catch (Exception ex)

            {

                return "Wrong Input. " + ex.Message;

            }

        }

    }

}

​