using System;

using System.IO;

using System.IO.Compression;

using System.Security.Cryptography;

​

public static class Program

{

    public static void Main(string[] args)

    {

        using (var des = new AesCryptoServiceProvider())

        {

            byte[] result;

​

            using (var ms = new MemoryStream())

            {

                using (var encryptor = des.CreateEncryptor())

                using (var cryptS = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))

                using (var defS = new DeflateStream(cryptS, CompressionMode.Compress))

                using (var bw = new BinaryWriter(defS))

                {

                    bw.Write("Hello, World.");

                }

​

                result = ms.ToArray();

            }

​

            using (var ms = new MemoryStream(result))

            using (var decryptor = des.CreateDecryptor())

            using (var cryptS2 = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))

            using (var defS = new DeflateStream(cryptS2, CompressionMode.Decompress))

            using (var br = new BinaryReader(defS))

            {

                var x = br.ReadString();

                Console.WriteLine(x);

            }

        }

    }

}