URI

Response.Redirect("DetailInfo.aspx?id=" + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes("sp10006")).Replace("+","%2B")); 　
        2.解密。string ID = System.Text.Encoding.Default.GetString(Convert.FromBase64String(Request.QueryString["id"].ToString().Replace("%2B","+")));
        二、DEC加密解密
        using System;
        using System.Security.Cryptography;
        using System.IO; using System.Text;
         namespace EIP.Framework {     
public class Security { string _QueryStringKey = "abcdefgh"; //URL传输参数加密Key string _PassWordKey = "hgfedcba";
    //PassWord加密Key
    public Security() { }
    public string EncryptQueryString(string QueryString) {
        return Encrypt(QueryString,_QueryStringKey); }
    public string DecryptQueryString(string QueryString) {
        return Decrypt(QueryString,_QueryStringKey); }
    public string EncryptPassWord(string PassWord) {
        return Encrypt(PassWord,_PassWordKey); }
    public string DecryptPassWord(string PassWord) {
        return Decrypt(PassWord,_PassWordKey); }
    /// /// DEC 加密过程 /// /// /// ///
    public string Encrypt(string pToEncrypt,string sKey) {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中
        byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);
        des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密对象的密钥和偏移量 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
        //原文使用ASCIIEncoding.ASCII方法的GetBytes方法
        MemoryStream ms = new MemoryStream(); //使得输入密码必须输入英文文本
        CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(),CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock();
        StringBuilder ret = new StringBuilder(); foreach(byte b in ms.ToArray()) {
            ret.AppendFormat("{0:X2}", b); } ret.ToString(); return ret.ToString(); } ///
    /// DEC 解密过程 /// /// /// ///
    public string Decrypt(string pToDecrypt, string sKey) {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
        for(int x = 0; x < pToDecrypt.Length / 2; x++) {
            int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
            inputByteArray[x] = (byte)i; } 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
        des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock();
        StringBuilder ret = new StringBuilder(); //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
        return System.Text.Encoding.Default.GetString(ms.ToArray()); }
    /// /// 检查己加密的字符串是否与原文相同 /// /// /// /// ///
    public bool ValidateString(string EnString, string FoString, int Mode) {
        switch (Mode) {
            default: case 1:
                if (Decrypt(EnString,_QueryStringKey) == FoString.ToString()) {
                    return true;
                } else {
                    return false;
                 } case 2:
                     if (Decrypt(EnString,_PassWordKey) == FoString.ToString()) {
                         return true; } else { return false; } } } } }
// 类中URL及帐号加密使用了不同的KEY。调用URL加密过程如下：
EIP.Framework.Security objSecurity = new EIP.Framework.Security(); objSecurity.EncryptQueryString("待加密的字符串");
// 解密:
objSecurity.DecryptQueryString(''传递过来的参数);