字符串,求解密 ! ! !

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校园上网认证系统,ip是以url形式传递的

url的字符串为:238fc550267156614b948c1bfcf62031
本地ip地址为:172.27.33.12

url的字符串为:238fc5502671566116b967d3f1de55d2
本地ip地址为:172.27.33.16

url的字符串为:238fc550267156610ac646fd6a21a9b4
本地ip地址为:172.27.33.81

目前看出的规律是每8位字符对应一个IP段,其余的就看不出了,求大神解密一下,谢谢了.

第 1 条附言 · 2014-03-10 13:11:07 +08:00

认证的流程:
连接网线之后,计算机自动从dhcp服务器获取IP
用浏览器随便打开一个网址,比如百度 http://www.baidu.com ,然后会自动跳转到一个认证界面,地址栏的url变为: http://192.168.200.2/eportal/index.jsp?s=1a0a4585a5a79636eac40552adcce384&ip=238fc550267156614b948c1bfcf62031&url=ef52fc80d3066c62013a4d350b6ed240ea6306b89f0ea3ce&t=ace
其中ip应该是指本机的IP经过加密之后显示在url里面的,因为如果我把IP串替换成238fc5502671566116b967d3f1de55d2 , 这样的话认证成功之后,分配到172.27.33.16这个IP的人上网就无需认证了.
url应该把 http://www.baidu.com 经过加密之后呈现在地址栏的.因为认证成功之后有个链接是是"访问之前浏览的网页",也是就访问 http://www.baidu.com .

下面贴出页面代码:







	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3c.org/TR/1999/REC-html401-19991224/loose.dtd">
	<html locale="true" xhtml="http://www.w3.org/1999/xhtml">


	<head>
	<!-- ç¨äºçº¯ååºä¸çpcç»éé¡µé¢ -->
	<title>
	上网认证 \| ePortal
	</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<script type="text/javascript">window.history.forward();</script>
	<link rel="stylesheet" href="./css/login2.css" type="text/css" />

	<script language="Javascript">

	/**
	* æ¾ç¤ºéè¯¯ä¿¡æ¯çæ¹æ³
	*/
	function showErrorMessage() {
	var errorMessageTr = document.getElementById("errorMessageTr");
	var errorMessageTd = document.getElementById("errorMessageTd");

	if(false) {
	errorMessageTr.style.display = 'block'; //æ¾ç¤ºéè¯¯ä¿¡æ¯æ
	errorMessageTd.innerHTML = '<strong></strong>';
	}
	}

	</script>
	</head>

	<!-- 纯准出下的pc登陆页面 -->

	<style type="text/css">
	body {
	background-color: #eef0ef;
	}
	/错误信息提示表格的css样式/
	.errorMessageTable{width: 80%;}
	/错误提示信息所在的行的css样式/
	.errorMessageTr{height: 30px;}
	/错误提示信息的css样式/
	.errorMessageTd{font-size: 16px;color: red;}
	/**/
	.errorImage{height: 35;}


	/用户名、密码等表头的css样式/
	.SLoginFont1{color: #002F6B;font-size: 18px;}
	/用户名、密码、校验码输入框/
	.SLoginInput{
	color: #666666;
	border: 1px solid #B7B6B6;
	margin-bottom: 6px;
	font-family: Verdana, Arial, Helvetica, sans-serif;
	font-size: 14px;
	background-color: #FFFFFF;
	padding-top: 3px;
	height: 25px;
	padding-bottom: 3px;
	}

	/验证码图片的css样式/
	.validcodeImg{vertical-align:middle;height: 21;}
	/登陆按钮的样式/
	.loginButton{color: #002F6B;font-size: 18px;width:100px;}

	/公告提示信息所在的table的css样式/
	.noticeTable{width: 100%;}
	/点击登录时的登录信息提示栏的css样式/
	.notice_panel_head{text-align: center;background: #BFEBAA;}

	/系统通知所在的table的css样式/
	.sysNoticeTable{width: 100%;}
	/系统通知的头部的css样式/
	.sysNoticeTitle{color: #EC5600;font-family: '幼圆';font-size: 18px;text-align: left;}
	/系统通知的内容所在的行的css样式/
	.sysNoticeContentTd{text-align: left;}
	/系统通知的内容的css样式/
	.sysNoticeContent{font-size: 14px;}
	/系统通知上方的hr横线的css样式/
	.sysNoticeHr{width: 100%;}

	/公告栏所在的table的css样式/
	.publishTable{width: 100%;}
	/公告标题的css样式/
	.publishTitle{FONT-FAMILY: '幼圆'; COLOR: #ec5600; FONT-SIZE: 18px;text-align: left;}
	/公告内容的css样式/
	.publishContext{text-align: left;}
	/公告栏上方的hr横线的css样式/
	.publishHr{width: 100%;}
	</style>

	<body oncontextmenu="return false;" onload="loginForm.username.focus();showErrorMessage();">
	<center>
	<table width="800" border="0" cellpadding="0" cellspacing="0" background="images/mobile/bj.jpg">
	<tr>
	<td height="458">
	<table width="800" border="0" cellpadding="0" cellspacing="0">
	<tr>
	<td width="323" height="116">
	<br>
	</td>
	<td width="477">


	<table width="90%">
	<tr>
	<td align="center">
	<table>
	<tr>
	<td>
	<strong style="color: #EC5600;font-family: '幼圆';font-size: 25px;">

	</strong>
	</td>
	</tr>
	</table>
	</td>
	</tr>
	<tr>
	<td>

	</td>
	</tr>
	<tr>
	<td>
	<!-- 用户登陆信息控件 -->








	<html>
	<head>

	<title>纯准出时用于Pc的用户登陆信息组件</title>
	<script language="javascript" src="./js/jquery-1.3.1.js"
	type="text/javascript"></script>

	<script type="text/javascript">

	function killErrors() {
	return true;
	}
	window.onerror = killErrors;

	var formName = 'loginForm';

	function $F(name){
	var form = document.getElementById(formName); //表单对象
	var input = form[name]; //获取表单中指定名称的标签的值
	return input.value;
	}

	function $FE(name){
	var form = document.getElementById(formName);
	var input = form[name];
	return input;
	}

	//错误图标
	var CONS_IMG_ERROR="<img src=\"./images/cc_error.gif\" align=\"absmiddle\">";
	//正确图标
	var CONS_IMG_RIGHT="<img src=\"./images/cc_right.gif\">";

	/**
	* 验证移动方案用户认证表单的方法
	* @returns {Boolean}
	* 表单合格返回true
	* 否则返回false
	*/
	function checkForm(){
	var myUser = document.getElementById("myUser");
	var myPassword = document.getElementById("myPassword");

	var errorMessageTr = document.getElementById("errorMessageTr");
	errorMessageTr.style.display = 'none'; //隐藏错误信息提示栏

	var flag1 = false; //错误标记
	var flag2 = false;
	var flag3 = false;

	if ($F('username').replace(/(^\s)\|(\s$)/g, "") == '') { //去左右空格
	myUser.innerHTML = CONS_IMG_ERROR+'<span style="color:red;">请填写用户名</span>';
	$FE('username').select();
	flag1 = true;
	}else {
	myUser.innerHTML = CONS_IMG_RIGHT;
	document.getElementById("usernameHidden").value=encodeURIComponent(document.getElementById("username").value);
	}

	if ($F('pwd') == '') {
	myPassword.innerHTML = CONS_IMG_ERROR+'<span style="color:red;">请填写密码</span>';
	$FE('pwd').select();
	flag2 = true;
	}else {
	myPassword.innerHTML = CONS_IMG_RIGHT;
	}

	if('false'=='true'){
	var myValidcode = document.getElementById("myValidcode");

	if ($F('validcode').replace(/(^\s)\|(\s$)/g, "") == '') { //去左右空格
	myValidcode.innerHTML = CONS_IMG_ERROR+'<span style="color:red;">请填写验证码</span>';
	$FE('validcode').select();
	flag3 = true;
	}else {
	myValidcode.innerHTML = CONS_IMG_RIGHT;
	}
	}

	if(flag1 == false && flag2 == false && flag3 == false) {
	return true;
	}else {
	return false;
	}
	}

	/**
	* 提交表单
	*/
	function doauthen_pure_internet(){
	if(checkForm()==true){
	openAuthingWindow();
	document.getElementById('loginForm').submit();
	}
	}

	/**
	* 显示认证提示栏
	*/
	function openAuthingWindow(){
	jQuery('#authing_wait').show();
	}

	/**
	* 刷新验证码图片的方法
	*/
	function freshImage(){
	if(self==top){
	jQuery('#validImage').attr('src',"./validcode?rnd="+Math.random());
	}else{
	alert('禁止在框架内的页面认证');
	top.location.href=self.location.href;
	}
	}

	/**
	* 登陆页面加载时自动获取一张验证码图片
	*/
	jQuery(document).ready(function(){
	if (self==top){
	//jQuery("#forceSwitchAddUser").attr("src",forceUrl+Math.random()); //会使login_foot.jsp页面的<img id="forceSwitchAddUser"标签自动请求一次后台
	jQuery("#validImage").attr("src","./validcode?rnd="+Math.random());
	}
	});

	/**
	* 只允许输入数字
	* @param t
	*/
	function inputNum(t){
	t.value = t.value.replace(/[^\d]/g,"");
	}

	var request = false;
	function createRequest(){
	request=createHttpAjaxRequest();
	}
	function createHttpAjaxRequest(){
	var httpRequestAjax;
	try {
	httpRequestAjax = new XMLHttpRequest();
	if (httpRequestAjax.overrideMimeType) {//设置MiME类别
	httpRequestAjax.overrideMimeType('text/xml');
	}
	return httpRequestAjax;
	}catch(e){

	}
	var versions = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
	for(var i=0; i<versions.length; i++) {
	try {
	httpRequestAjax = new ActiveXObject(versions[i]);
	return httpRequestAjax;
	} catch(e){

	}
	}
	throw {
	name: 'GetRequestObject',
	message: 'XMLHttpRequest is not available, xajax is disabled'
	}
	}

	/**
	* 清除保存的用户登陆信息
	*/
	function clearLoginInfo(){
	delCookie("EPORTAL_COOKIE_USERNAME");
	delCookie("EPORTAL_COOKIE_PASSWORD");
	var saveUserInfo = document.getElementById("saveUserInfo");
	saveUserInfo.innerHTML = '<input type="checkbox" name="is_check" id="is_check" value="true" />保存登录信息（两周） ';
	}

	// IE、遨游、Opera、Safari、Chrome 兼容回车事件
	document.onkeydown = function() {
	if (window.event.keyCode == 13) {
	document.getElementById("loginButton").click();
	}
	};

	//Firefox 兼容回车事件
	if (document.addEventListener) {
	document.addEventListener("keypress", fireFoxHandler, true);
	}

	function fireFoxHandler(event) {
	if (event.keyCode == 13) {
	//doauthen_pure_internet();
	var evt = document.createEvent("MouseEvents");
	evt.initEvent("click",true,true);
	document.getElementById("loginButton").dispatchEvent(evt); //触发登陆按钮的点击事件
	}
	}

	var authModeflag="";
	/**
	* 清除保存的用户登陆信息
	*/
	function clearLoginInfo(){
	try{
	delCookie("EPORTAL_COOKIE_USERNAME");
	delCookie("EPORTAL_COOKIE_PASSWORD");
	createRequest();
	var url = "./user.do?method=deleteCookie&rnd="+Math.random();
	request.open("GET", url, true);
	var funcName;
	request.onreadystatechange = loadCurpage;
	request.send(null);
	} catch(e){
	if(authModeflag=='web'){
	var redirectUrl = document.getElementById('redirectUrl').value;
	window.location.href= redirectUrl+"&redirectFlag="+authModeflag;
	}else{
	window.location.reload();
	}
	}
	}
	function loadCurpage(){
	if(request.readyState==4){
	if (request.status == 200) {
	if(authModeflag=='web'){
	var redirectUrl = document.getElementById('redirectUrl').value;
	window.location.href= redirectUrl+"&redirectFlag="+authModeflag;
	}else{
	window.location.reload();
	}
	}
	}
	}

	function getCookie(name){
	var arr = document.cookie.match(new RegExp("(^\| )"+name+"=([^;]*)(;\|$)"));
	if(arr != null) return unescape(arr[2]); return null;
	}

	function delCookie(name){
	var exp = new Date();
	exp.setTime(exp.getTime() - 1);
	var cval=getCookie(name);
	if(cval!=null)
	document.cookie= name + "=;expires="+exp.toGMTString();//ie8此不起作用
	}

	</script>
	</head>

	<body>
	<form name="loginForm" id="loginForm" method="post" action="webgateuser.do?method=login_ajax_pure_internet">
	<input type="hidden" name="s" id="s" value='1a0a4585a5a79636eac40552adcce384' />
	<input type="hidden" name="userIp" id="userIp" value='172.27.33.12' />
	<input type="hidden" name="url" id="url" value='http://www.baidu.com/' />
	<input type="hidden" name="t" id="t" value='ace' />
	<input type="hidden" name="ip" id="t" value='238fc550267156614b948c1bfcf62031' />
	<input type="hidden" name="dst_url" id="dst_url" value='0b9e64ac68b3a501b3e80cc709e62948d4c2e9db624afc4a' />

	<input type="hidden" name="authType" id="authType" value='web' />

	<table class="errorMessageTable" >
	<tr id="errorMessageTr" class="errorMessageTr" align="center" style="display: none;">
	<td id="errorMessageTd" class="errorMessageTd" >

	</td>
	</tr>
	<tr id="authing_wait" class="notice_panel_head" style="display: none;">
	<td class="notice_panel_head" >
	正在认证，请稍候.....
	</td>
	</tr>
	</table>
	<table class="LoginTable">
	<tr id="uName">
	<td class="SLoginFont1">
	用户名:
	</td>
	<td colspan="2" align="left">
	<input name="username" id="username" type="text" class="SLoginInput" maxlength="80" size="20" tabindex="1" value="" />
	<input name="usernameHidden" id="usernameHidden" type="hidden" value="" />
	</td>
	<td align="left">
	<span id="myUser" class="b" ></span>
	</td>
	</tr>
	<tr>
	<td class="SLoginFont1">
	密   码:
	</td>
	<td colspan="2" align="left">
	<input name="pwd" id="pwd" type="password" class="SLoginInput" maxlength="80" size="20" tabindex="2" value="" />
	</td>
	<td align="left">
	<span id="myPassword" class="b"></span>
	</td>
	</tr>

	<!-- 安全域 -->


	<input name="seczone" id="seczone" type="hidden" value="" />


	<!-- validateCode 验证码-->

	<tr>
	<td colspan="4">
	<input name="validcode" id="validcode" type="hidden" value="no_check" />
	</td>
	</tr>


	<!-- saveUserInfo Web -->
	<tr id="web" >
	<td colspan="4">
	<div class="inputItem">
	<div class="inputItemValue" >

	<input type="checkbox" name="is_check" id="is_check" value="true" />
	保存登录信息（两周）




	</div>
	</div>
	</td>
	</tr>

	<tr>
	<td class="SLoginFont1">

	</td>
	<td colspan="2" align="left">
	<input type="button" id="loginButton" name="loginButton" class="loginButton" onclick="doauthen_pure_internet();" value="访问外网" />
	</td>
	<td align="left">

	</td>
	</tr>
	</table>
	</form>
	<script type="text/javascript">
	var authType = document.getElementById('authType').value;
	if(authType=='web'){
	document.getElementById('web').style.display="";
	}
	</script>
	</body>
	</html>

	</td>
	</tr>
	</table>
	</td>
	</tr>
	</table>
	</td>
	</tr>
	</table>

	<table width="800" border="0" cellpadding="0" cellspacing="0">
	<tr>
	<td>
	<!-- 认证客户端相关控件 -->








	<html>
	<head>

	<title>认证客户端相关组件</title>

	</head>

	<body>
	<table class="noticeTable">
	<tr>
	<td class="noticeContext">



	</td>
	</tr>
	</table>
	</body>
	</html>

	</td>
	</tr>
	<tr>
	<td>
	<!-- 公告提示信息控件 -->







	<html>
	<head>

	<title>公告提示信息组件</title>

	</head>

	<body>
	<table class="noticeTable">
	<tr>
	<td class="noticeContext">

	</td>
	</tr>
	</table>
	</body>
	</html>

	</td>
	</tr>
	<tr>
	<td>
	<!-- 系统通知 -->









	<html>
	<head>
	<title>系统通知组件</title>

	</head>

	<body>

	<table class="sysNoticeTable" id="sysNoticeTable" style="display:none;" >
	<tr>
	<td class="sysNoticeTitle">
	<strong>
	系统通知:
	</strong>
	</td>
	</tr>
	<tr>
	<td class="sysNoticeContentTd">
	<span class="sysNoticeContent" id="noticeSpan"> </span>
	</td>
	</tr>
	</table>

	</body>
	</html>

	<br>
	</td>
	</tr>
	<tr>
	<td>
	<!-- 公告组件 -->








	<html lang="zh">
	<head>
	<title>公告信息组件</title>

	</head>

	<body>

	<hr class="publishHr"/>

	<table class="publishTable">
	<tr>
	<td class="publishTitle">
	<strong>公告：</strong>
	</td>
	</tr>
	<tr>
	<td class="publishContext" >
	<p>
	</p>
	<p>
	<span style="color: #0099cc"><span style="font-size: 14px">各位老师：</span></span></p>
	<p>
	<span style="color: #0099cc"><span style="font-size: 14px"> </span></span></p>
	<pre>
	<span style="color: #0099cc"><span style="font-size: 14px"> </span><span style="font-size: 14px">此处打马赛克!!!</span><span style="font-size: 14px">。</span></span></pre>

	</td>
	</tr>
	</table>

	</body>
	</html>

	</td>
	</tr>
	</table>
	</center>
	</body>
	</html>