1  /**//// <summary>
 2         /// DEC 加密过程
 3         /// </summary>
 4         /// <param name="pToEncrypt">被加密的字符串</param>
 5         /// <param name="sKey">密钥（只支持8个字节的密钥）</param>
 6         /// <returns>加密后的字符串</returns>
 7         public string Encrypt(string pToEncrypt, string sKey)
 8         {
 9             //访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象
10             DESCryptoServiceProvider des = new DESCryptoServiceProvider();　
11             des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量
12             des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
13 
14             byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);//把字符串放到byte数组中
15 
16             MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流　
17             //定义将数据流链接到加密转换的流
18             CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
19             cs.Write(inputByteArray, 0, inputByteArray.Length);
20             cs.FlushFinalBlock();
21             //上面已经完成了把加密后的结果放到内存中去
22 
23             StringBuilder ret = new StringBuilder();
24             foreach (byte b in ms.ToArray())
25             {
26                 ret.AppendFormat("{0:X2}", b);
27             }
28             ret.ToString();
29             return ret.ToString();
30         }

 1  /**//// <summary>
 2         /// DEC 解密过程
 3        /// </summary>
 4         /// <param name="pToDecrypt">被解密的字符串</param>
 5         /// <param name="sKey">密钥（只支持8个字节的密钥，同前面的加密密钥相同）</param>
 6        /// <returns>返回被解密的字符串</returns>
 7         public string Decrypt(string pToDecrypt, string sKey)
 8         {
 9             DESCryptoServiceProvider des = new DESCryptoServiceProvider();
10 
11             byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
12             for (int x = 0; x < pToDecrypt.Length / 2; x++)
13             {
14                 int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
15                 inputByteArray[x] = (byte)i;
16             }
17 
18             des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥和偏移量，此值重要，不能修改
19             des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
20             MemoryStream ms = new MemoryStream();
21             CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
22 
23             cs.Write(inputByteArray, 0, inputByteArray.Length);
24             cs.FlushFinalBlock();
25 
26             //建立StringBuild对象，createDecrypt使用的是流对象，必须把解密后的文本变成流对象
27             StringBuilder ret = new StringBuilder();　
28 
29             return System.Text.Encoding.Default.GetString(ms.ToArray());
30         }

1 在发送页面
2 Response.Redirect("~/GridView.aspx?ID=" + Encrypt("zlh","12345678"));
3 
4 在接受页面
5 string acceptStr;
6 acceptStr = Decrypt(Request.QueryString["ID"],"12345678");