如下的代码段是关于C#对文件进行加密解密的代码，应该是对小伙伴们有些帮助。

using System;

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

public class Example19_9

{ public static void Main(){

FileStream fsOut = File.Create(@"c:tempencrypted.txt");    TripleDESCryptoServiceProvider tdes =        new TripleDESCryptoServiceProvider();    CryptoStream cs = new CryptoStream(fsOut, tdes.CreateEncryptor(),        CryptoStreamMode.Write);    StreamWriter sw = new StreamWriter(cs);    sw.WriteLine("'Twas brillig, and the slithy toves");    sw.WriteLine("Did gyre and gimble in the wabe.");    sw.Flush();    sw.Close();    FileStream fsKeyOut = File.Create(@"c:\tempencrypted.key");    BinaryWriter bw = new BinaryWriter(fsKeyOut);    bw.Write( tdes.Key );    bw.Write( tdes.IV );    bw.Flush();    bw.Close();}

}

解密代码如下

using System;

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

public class Example19_10

{ public static void Main(){

TripleDESCryptoServiceProvider tdes =        new TripleDESCryptoServiceProvider();    FileStream fsKeyIn = File.OpenRead(@"c:tempencrypted.key");    BinaryReader br = new BinaryReader(fsKeyIn);    tdes.Key = br.ReadBytes(24);    tdes.IV = br.ReadBytes(8);    FileStream fsIn = File.OpenRead(@"c:\temp\encrypted.txt");    CryptoStream cs = new CryptoStream(fsIn, tdes.CreateDecryptor(),        CryptoStreamMode.Read);    StreamReader sr = new StreamReader(cs);    Console.WriteLine(sr.ReadToEnd());    sr.Close();}

}