验证码破解和反破解的思路

使用php破解验证码，只有一种方法，就是收集验证码里出现字符的特征码，然后想办法分离出验证码里的字符。什么人工智能，显然是php做不到的，所以，只要能收集齐验证码里出现字符的特征码，又能找到方法分离出验证码里的字符，就可以破解。
反破解的思路也主要是围绕这两步，使用更多的字符，比如使用中文，使用更多的字体和变形，使得同一个字符有多个特征码，或者没有固定的特征码。增加分离字符的难度，字符出现在验证码中的位置不固定，大小不固定，间距不固定，干扰像素要能起到作用。
下面以某网站验证码为例，讲解如何通过以上两步破解验证码。
注：部分代码来源于phper“罢巴”，特别鸣谢！

1. /* 对数值数值进行排序，找到第二多的元素，因为第一多的元素是背景色，第二多才是字符颜色，换句话说，如果每个字符都使用不同的颜色，或者背景色不是那么单调，我还怎么分离出字符颜色呢？ */
2. function getMostRepeated($array){
3. $count = array_count_values($array);
4. arsort($count);
5. $keys = array_keys($count);
7. return $keys[1];
8. }
9. /* 读取验证码图片，并将像素RGB读入二维数组，然后分离出有效字符 */
10. function fixImg($url){
11. $img = imagecreatefrompng($url);
13. $with = imagesx($img);
14. $height = imagesy($img);
15. $middle = $height / 2;
17. $colors = array();
19. for ($i = 0; $i $color = imagecolorat($img, $i, $middle);// 读取中线的像素颜色，中线肯定会切到字符。。。
20. $colors[] = $color;
21. }
23. $mainColor = getMostRepeated($colors);// 分离出字符颜色
24. $pic = array();
26. for ($x = 0; $x $flag = true;
27. for ($y = 0; $y $currentColor = imagecolorat($img, $x, $y);
28. $pos = 0;// 原图片用的是斜体，为了方便分割字符，转成正体，所以用斜体是没用的。。。
29. if($y $pos = 0;
30. }elseif($y >= 16 && $y $pos = 1;
31. $pic[$y][0] = 0;
32. }elseif($y >= 21 && $y $pos = 2;
33. $pic[$y][0] = $pic[$y][1] = 0;
34. }else{
35. $pos = 3;
36. $pic[$y][0] = $pic[$y][1] = $pic[$y][2] = 0;
37. }
38. // 因为干扰像素和字符的颜色完全不同，轻而易举的分离出字符色，字符像素点置1，所以干扰像素颜色至少要有部分是和字符颜色相同才行！
39. if ($currentColor !== $mainColor) {
40. $pic[$y][$x+$pos] = 0;
41. }else{
42. $pic[$y][$x+$pos] = 1;
43. $flag = false;
44. }
45. }
46. }
48. return $pic;
49. }
50. // 传说中的特征码
51. $char = array(
52. 'A'=>'000000000000000000010000000000000000010110000000000000001111100000000000000011101000000000000011111000000000000001111110000000000001011100110000000000111110000110000000001110100000110000000111100000000110000000111111000000110000000111111111000110000000000011111110110000000000000111111110000000000000000111111110000000000000001111111000000000000000011111110000000000000000001110000000000000000000110',
53. 'B'=>'111111111111111111110111111111111111111110111111111111111111110110000000110000000110110000000110000000110110000000110000000110110000001110000000110111000011111000000110111111111001100011110011111110001111111100001110100001111111100000000000000111101000',
54. 'C'=>'000001011110000000000000011111111111110000000111111111111110000001110100001111111000011100000000000011100011000000000000001100011000000000000001110110000000000000001110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000001100011000000000000001100011000000000000011000',
55. 'D'=>'111111111111111111110111111111111111111110111111111111111111110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110111000000000000001110011000000000000011100011110000000000111100001111000000001111000000111111111111111000000011111111111100000000000111111110000000',
56. 'E'=>'111111111111111111110111111111111111111110111111111111111111110110000000110000000110110000000110000000110110000000110000000110110000000110000000110110000000110000000110110000000110000000110110000000110000000110110000000000000000110000000000000000000110',
57. 'F'=>'111111111111111111110111111111111111111110111111111111111111110110000000110000000000110000000110000000000110000000110000000000110000000110000000000110000000110000000000110000000110000000000110000000110000000000110000000000000000000',
58. 'G'=>'000001011110000000000000011111111111110000000111111111111110000001110100001111111000011100000000000011100011000000000000001100011000000000000001110110000000000000001110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000001111111110011000000001111111100011000000001111111100',
59. 'H'=>'111111111111111111110111111111111111111110111111111111111111110000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000111111111111111111110111111111111111111110111111111111111111110',
60. 'I'=>'111111111111111111110111111111111111111110111111111111111111110',
61. 'J'=>'111111111111111111111111111111111111111111111111111111111111110',
62. 'K'=>'111111111111111111110111111111111111111110111111111111111111110000000000110000000000000000001110000000000000000011011000000000000001111001110000000000011110001111000000000111100000111100000001110000000001110000011100000000000111000111000000000000011100110000000000000001110100000000000000000110000000000000000000010',
63. 'L'=>'111111111111111111110111111111111111111110111111111111111111110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110',
64. 'M'=>'111111111111111111110111111111111111111110111111000000000000000111111100000000000000000111111110000000000000000111111000000000000000011111111100000000000000001111110000000000000000111111100000000000000000111100000000000000011111100000000000010111000000000000001111100000000000011111101000000000000111110000000000000011100000000000000000111111111111111111110111111111111111111110111111111111111111110',
65. 'N'=>'111111111111111111110111111111111111111110111110000000000000000011111000000000000000000111100000000000000000001110000000000000000000111100000000000000000011110000000000000000000111000000000000000000001110000000000000000001111100000000000000000111110000000000000000001111000000000000000000011110111111111111111111110111111111111111111110',
66. 'O'=>'000001011110000000000000011111111111100000000111111111111110000001110100000011111000011100000000000011100011000000000000001100011000000000000001110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110111000000000000000110011000000000000011100011110000000000111100001111000000001111000000111111111111111000000001111111111100000000000111111110000000',
67. 'P'=>'111111111111111111110111111111111111111110111111111111111111110110000000011000000000110000000011000000000110000000011000000000110000000111000000000110000000111000000000111100001110000000000011111111100000000000011111111000000000000000111110000000000000',
68. 'Q'=>'000001011110000000000000011111111111100000000111111111111110000001110100001111111000011100000000000011100011000000000000001100010000000000000001110110000000000000000110110000000000000000110110000000000000000110110000000000000000110110000000000000000110111000000000000000111011000000000000011111011110000000000111101001111000000001111001000111111111111110000000001111111111000000000000111111110000000',
69. 'R'=>'111111111111111111110111111111111111111110111111111111111111110110000000110000000000110000000110000000000110000000110000000000110000000110000000000110000001111100000000111001011101111000000111111111001111110000011111111000011110000001110110000000111100000000000000000001110000000000000000001110000000000000000000010',
70. 'S'=>'000111000000000001000001111110000000001100011111111000000001100011000111100000000110110000011110000000110110000001110000000110110000001110000000110110000000111000000110110000000011100011100111000000011111111100011000000001111111000000000000001111100000',
71. 'T'=>'110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000111111111111111111110111111111111111111110111111111111111111110110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000',
72. 'T '=>'110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000111111111111111111110111111111111111111110111111111111111111110110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000',//vt时t左边会被侵占掉一列
73. 'U'=>'111111111111111110000111111111111111110000111111111111111111100000000000000000001100000000000000000001110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000000110000000000000000001100000000000000000111100111111111111111111000111111111111111000000',
74. 'V'=>'111100000000000000000111111000000000000000111111111000000000000000001111110000000000000000111111100000000000000000111111110000000000000001111111000000000000000001111110000000000000000011110000000000000001111110000000000010111101000000000000111110000000000001011111000000000000111111000000000000001110100000000000000111100000000000000000',//少读一列
75. 'W'=>'111111000000000000000111111111000000000000111111111110000000000000000111111111110000000000001111111110000000000000001111111110000000000000000111110000000000000011111110000000001111111001000000011111111100000000011111110000000000000111111000000000000000111111000000000000000111111111110000000000000000111111111110000000000011111111111000000000000001111111110000000000000000111110000000000000011111110000000001111111001000000011111111100000000001111111000000000000111110100000000000000',
76. 'X'=>'000000000000000000010110000000000000000110111100000000000011100111111000000000111000001111000000001100000000011110000011000000000000111110110000000000000111111100000000000000001111000000000000000001111100000000000001111001111000000000011110001111110000000111100000011110000001110000000000111100011100000000000001110110000000000000001110100000000000000000010',
77. 'Y'=>'110000000000000000000111100000000000000000111111000000000000000001111000000000000000000011111000000000000000000111110000000000000000111111111111110000000000111111111110000000001111111111110000000011100000000000000001111000000000000000111100000000000000001110000000000000000011100000000000000000110000000000000000000100000000000000000000',
78. 'Z'=>'000000000000000000110110000000000000011110110000000000001111110110000000000011111110110000000000111100110110000000011110000110110000000111100000110110000011111000000110110001111100000000110110011111000000000110110111100000000000110111110000000000000110111100000000000000110111000000000000000110',
79. '0'=>'000001011110100000000000111111111111110000001111111101111110000011100000000000011100011000000000000001100110000000000000001110110000000000000000110110000000000000000110110000000000000000110111000000000000011100011111000000000111100001111111110111111000000011111111111100000000000111111110000000',
80. '1'=>'001100000000000000110001100000000000000110011000000000000000110011000000000000000110011111111111111111110011111111111111111110111111111111111111110000000000000000000110000000000000000000110000000000000000000110000000000000000000110',
81. '2'=>'000000000000000000110001100000000000111110011000000000000111110011000000000001101110110000000000011000110110000000000111000110110000000001110000110110000000011100000110111000000111000000110111100001111000000110011111111100000000110001111111000000000110000111110000000000110',
82. '3'=>'011000000000000001100010000000000000001100110000000110000000110110000000110000000110110000000110000000110110000000110000000110110000001110000000110111000011011000001110111111111011000011100011111110001111111100001110100001111111000000000000000111101000',
83. '4'=>'000000000000110000000000000000011110000000000000000111110000000000000001100110000000000001111000110000000000011110000110000000000111100000110000000001110000000110000000011100000000110000000111111111111111111110111111111111111111110111111111111111111110000000000000110000000000000000000110000000000000000000110000000',
84. '5'=>'111111111000000001100111111111000000001110110000011000000000110110000011000000000110110000011000000000110110000011000000000110110000001100000000110110000001110000001110110000001110000111100110000000111111111100110000000011111111000110000000001111100000',
85. '6'=>'000001011110111000000000011111111111110000001111111111111111000001110100101000011100011000001100000001100011000001000000001110110000011000000000110110000011000000000110110000011000000000110110000011100000000110110000011110000011100111000001111111111100011000000111111111000000000000001111000000',
86. '7'=>'110000000000000000000110000000000000000010110000000000000111110110000000000011111110110000000000111111100110000000011111000000110000001111100000000110000011101000000000110001111000000000000110111110000000000000111110000000000000000111100000000000000000111000000000000000000',
87. '8'=>'000000000000011110000000111000000111111000001111110011111111100011111111111100001100011000111111000001110110000011100000000110110000011110000000110110000001110000000110110000001111000000110111001011111000000110111111110011100011100011111110001111111100001110100001111111000000000000000111100000',
88. '9'=>'000011111100000000000001111111110000001100001111111110000001100011100000111000000110111000000011100000110110000000001100000110110000000001100000110110000000001100000110110000000001100001100111000000011000011100011111000111001111000001111111111111111000000111111111111000000000000111111110000000',
89. );
91. $arr = fixImg("https://xxxxxxxxxx");// 哦，这里隐去某社区域名和验证码地址，为了支持https，你的php环境要开启openssl
92. for($i = 0;$i unset($arr[$i]);// 前10行是空白
94. $y = 0;// 采用从上到下，从左到右顺序读特征码，从第0行开始（实际是第10行）
95. $len = 31;// 多读一行，JQ超过20行，且J后面几行占了上个字符的位置
96. $code = array();// 分离出来的字符特征码
97. $str = '';
99. while($y $flag = true;// 全0是空白竖线
100. $line = '';
101. for($i = 10;$i if($arr[$i][$y])
102. $flag = false;
103. $line .= $arr[$i][$y];
104. }
105. $isw = false;
106. $isy = false;
107. // 对vw的特殊处理
108. if($str === $char['V'] || $str === $char['W']){
109. $flag = true;
110. $isw = true;
111. }elseif($str === $char['Y'] || $str === $char['A']){
112. $isy = true;
113. $flag = true;
114. }
116. if($flag){
117. if(strlen($str) > 21)
118. $code[] = $str;
119. $str = '';
120. }else{
121. $str .= $line;
122. }
123. if($isw){
124. $str = '00'.substr($line,2,strlen($line));
125. if($str === '000000000000000000000')
126. $str = '';
127. $isw = false;
128. }
129. if($isy){
130. $str = $line;
131. if($str === '000000000000000000000')
132. $str = '';
133. $isy = false;
134. }
135. $y++;
137. }
139. // 输出字符
140. foreach($code as $v){
141. $match = false;
142. foreach($char as $key => $v2){
143. if($v === $v2){
144. echo $key;
145. $match = true;
146. }
147. }
148. if(!$match)
149. echo '?';// 没匹配到的字符输出问号
150. }

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