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Secret Key Cryptography

using System; using System.IO; using System.Text; using System.Security.Cryptography;   class Class1   {     static void Main(string[] args)     {       byte[] bin = new byte[100];       FileStream fsIn = new FileStream("input.txt", FileMode.Open, FileAccess.Read);       long rdLen = 0;       long totLen = fsIn.Length;       int len;       // RC2       RC2CryptoServiceProvider rc2 = new RC2CryptoServiceProvider();       rc2.GenerateIV();       rc2.GenerateKey();       FileStream fsOut_RC2 = new FileStream("outputRC2.txt", FileMode.Create, FileAccess.Write);       CryptoStream rc2Stream = new CryptoStream( fsOut_RC2,         rc2.CreateEncryptor(), CryptoStreamMode.Write);       while ( rdLen < totLen )       {         len = fsIn.Read(bin, 0, 100);         System.Diagnostics.Debug.WriteLine("Read " + len.ToString() + " bytes.");         rc2Stream.Write(bin, 0, len );                  rdLen += len;         Console.WriteLine("{0} Bytes Read.", rdLen );       }       fsIn.Close();     }   }