url 传递参数加密问题

    //// <summary>
    /// DEC 加密过程
    /// </summary>
    /// <param name="pToEncrypt">被加密的字符串</param>
    /// <param name="sKey">密钥（只支持8个字节的密钥）</param>
    /// <returns>加密后的字符串</returns>
    public string Encrypt(string pToEncrypt, string sKey)
    {
        //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
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);　//建立加密对象的密钥
        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);　 //偏移量

        byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);//把字符串放到byte数组中

        System.IO.MemoryStream ms = new System.IO.MemoryStream();//创建其支持存储区为内存的流　
        //定义将数据流链接到加密转换的流
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        //上面已经完成了把加密后的结果放到内存中去

        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        ret.ToString();
        return ret.ToString();
    }