Encrypting a file : Encrypt Decrypt File « File Directory Stream « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. File Directory Stream
3. Encrypt Decrypt File

using System;
using System.IO;
using System.Security.Cryptography;

class MainClass
{
  public static void Main() 
  {
    FileStream fsOut = File.Create(@"c:\encrypted.txt");

    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

    CryptoStream cs = new CryptoStream(fsOut, tdes.CreateEncryptor(), CryptoStreamMode.Write);

    StreamWriter sw = new StreamWriter(cs);

    sw.WriteLine("str");
    sw.Flush();
    sw.Close();

    FileStream fsKeyOut = File.Create(@"c:\encrypted.key");
    
    BinaryWriter bw = new BinaryWriter(fsKeyOut);

    bw.Write( tdes.Key );
    bw.Write( tdes.IV );

    bw.Flush();
    bw.Close();
  }
}