1.背景
最近整理以前的文件，發了一篇有意思的關於極驗驗證碼破解思路的文章。現在回過頭來思考感覺挺有意思的，分享給大家。
百度百科對極驗的定義如下：
極驗驗證是一種在計算機領域用於區分自然人和機器人的，通過簡單集成的方式，爲開發者提供安全、便捷的雲端驗證服務。與以往傳統驗證碼不同的是，
極驗通過分析用戶完成拼圖過程中的行爲特徵，
通過數據分析來判斷是人還是機器。用戶不必面對眼花繚亂的英文字符或漢字，整個驗證過程變的像遊戲一樣有趣。
2.思路
第1步：
破解極驗的思路主要是研究它的js以及分析攔截的http請求，通過研究發現訪問如下截圖1的url，就可以得到兩張圖片，解析出兩張圖片的名稱，假設爲bg和slice。
圖2可以理解爲bg圖片，圖2的圖片有一部分陰影；圖3可以理解爲slice圖片，切出來的圖片是亂碼，這些亂碼圖片需要通過css切圖代碼才能還原。css的切片代碼見如下，把代碼中的$$$$$$$$$$$替換爲我們解析出的名稱，就能拼湊出如下的完整圖片。
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<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -133px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -61px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -49px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -217px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -229px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -205px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -193px -58px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -145px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -157px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -277px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -265px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -169px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -181px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -253px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -241px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -97px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -109px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -301px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -289px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -73px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -85px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -37px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -25px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -1px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -13px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -133px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -121px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -49px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -61px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -229px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -217px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -193px 0px;"></div>
<div class="gt_ads_cut_slice" style="background-image: url(http://static.geetest.com/$$$$$$$$$$$); background-position: -205px 0px;"></div>
</div>
</body>
</html>
第2步:
圖片拿到後，我們就只需要獲取點位軌跡即可，獲取軌跡的方式一種是使用程序隨機模擬座標，這種方式準確率不高，容易被識別爲機器人。另一種方式是手動多拖幾百次，採集出座標點，把這些座標點進行微小變動拼湊出來。
第3步:
採集到座標點後，就需要通過Microsoft.JScript.Vsa;引擎調用JS方法userresponse產生用戶行爲，調用pushPoint添加座標點，調用f()方法產線加密的拖動軌跡。
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
};
第4步：
提交拼湊出的url。
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