极验的破解思路

  之前由于工作需要破解了极验验证码,在这里把之前总结的文档分享一下,目前有可能极验已经升级了,但总体思路应该还是相似的。

  首先百度百科对极验验证的定义:极验验证是一种在计算机领域用于区分自然人和机器人的,通过简单集成的方式,为开发者提供安全、便捷的云端验证服务。与以往传统验证码不同的是,极验通过分析用户完成拼图过程中的行为特征,通过数据分析来判断是人还是机器。用户不必面对眼花缭乱的英文字符或汉字,整个验证过程变的像游戏一样有趣。

  刚开始研究这个的时候,心想这个肯定很难搞,人家毕竟是一个公司,后来花了一个星期,慢慢的研究他的js,才发现并没有我想象的那么复杂,通过我们的分析发现极验判断的大致流程如下:

  1.首先是刷新出图片,访问下面截图的地址,然后解析出图片名称,返回图片有两张,图一bg图片,其中图一中的图片有阴影部分,图二是slice图片。切出来的图片都是乱码,需要通过css切图拼凑出来。css切图代码见附件一.把代码中的$$$$$$$$$$$替换为我们解析出的名称,就能拼凑出如下的完整图片。

 图片 1

图片 2

图片 3

图片 4

图片 5

  2.首先记录你拖动的轨迹(这个轨迹包含坐标点和时间序列,坐标点是以你点击截图中的红色框中的按钮即可),但是本次我们采用了两种方式获取坐标点,

一种手动拖几百次,采集出坐标点,因为这个图片最长为260,中间那个小块的长度就是40左右,所以拖动的距离范围一般在40-200之间,采集坐标点方法如下图一,每一个坐标点以空格隔开,具体采集点的方法看源码。

  另一种用程序随机模拟坐标,通过这种方式模拟的点准确率不高,容易被识别为机器人。

图片 6

 

图片 7

  1. 采集到坐标点后,就需要通过Microsoft.JScript.Vsa;引擎调用JS方法userresponse产生用户行为,调用pushPoint添加坐标点,调用f()方法产线加密的拖动轨迹。(JS见附件二)
  2. 最后拼凑出提交的URL

附件一:

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  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -133px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -61px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -49px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -217px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -229px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -205px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -193px -58px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -145px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -157px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -277px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -265px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -169px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -181px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -253px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -241px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -97px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -109px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -301px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -289px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -73px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -85px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -37px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -25px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -1px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -13px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -133px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -121px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -49px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -61px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -229px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -217px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -193px 0px;"></div>

  <div class="gt_ads_cut_slice" style="background-image: url(); background-position: -205px 0px;"></div>

</div>

</body>

</html>

附件二:

var allpoint = [];

function c(a) {

    for (var b = [

    ], c = 0; c < a.length - 1; c++) {

        var d = [

        ];

        d[0] = Math.round(a[c + 1][0] - a[c][0]),

        d[1] = Math.round(a[c + 1][1] - a[c][1]),

        d[2] = Math.round(a[c + 1][2] - a[c][2]),

        (0 !== d[0] || 0 !== d[1] || 0 !== d[2]) && b.push(d)

    }

    return b

};

 

function d(a) {

    var b = '()*,-./0123456789:?@ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqr',

      c = b.length,

      d = '',

      e = Math.abs(a),

      f = parseInt(e / c);

    f >= c && (f = c - 1),

      f && (d = b.charAt(f)),

      e %= c;

    var g = '';

    return 0 > a && (g += '!'),

      d && (g += '$'),

      g + d + b.charAt(e)

};

 

function e(a) {

    for (var b = [

        [1,

        0],

        [

          2,

          0

    ],

        [

          1,

          -1

    ],

        [

          1,

          1

    ],

        [

          0,

          1

    ],

        [

          0,

          -1

    ],

        [

          3,

          0

    ],

        [

          2,

          -1

    ],

        [

          2,

          1

    ]

    ], c = 'stuvwxyz~', d = 0, e = b.length; e > d; d++) if (a[0] == b[d][0] && a[1] == b[d][1]) return c[d];

    return 0

};

 

function f() {

    for (var b, f = c(allpoint), g = [

    ], h = [

    ], i = [

    ], j = 0, k = f.length; k > j; j++) b = e(f[j]),

    b ? h.push(b) : (g.push(d(f[j][0])), h.push(d(f[j][1]))),

    i.push(d(f[j][2]));

    var tt = g.join('') + '!!' + h.join('') + '!!' + i.join('');

    return tt;

};

 

 

function pushPoint(x, y, time) {

    allpoint.push([x, y, time]);

}

 

function gettrack() {

    return f();

};

 

function createtime() {

    return parseInt(10000 * Math.random()) + (new Date).valueOf()

};

 

function userresponse(a, b) {

    for (var c = b.slice(32), d = [

    ], e = 0; e < c.length; e++) {

        var f = c.charCodeAt(e);

        d[e] = f > 57 ? f - 87 : f - 48

    }

    c = 36 * d[0] + d[1];

    var g = Math.round(a) + c;

    b = b.slice(0, 32);

    var h,

    i = [

      [],

      [

      ],

      [

      ],

      [

      ],

      [

      ]

    ],

    j = {

},

    k = 0;

e = 0;

for (var l = b.length; l > e; e++) h = b.charAt(e),

    j[h] || (j[h] = 1, i[k].push(h), k++, k = 5 == k ? 0 : k);

for (var m, n = g, o = 4, p = '', q = [

      1,

      2,

      5,

      10,

      50

    ]; n > 0; ) n - q[o] >= 0 ? (m = parseInt(Math.random() * i[o].length, 10), p += i[o][m], n -= q[o]) : (i.splice(o, 1), q.splice(o, 1), o -= 1);

return p

};

 

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