网站验证码破解实战研究（一）

lp563161210 · 8 年前

验证码原图：

这种验证码是最简单的，只需要简单的几步就能完成破解

package com.xuanyao.server.imgcode;

import java.awt.image.BufferedImage;
import java.util.HashMap;
import java.util.Map;

public class AsiaImageCodeParse {

        private  int useXstart = 6;
        private  int useYstart = 5;
        private  int useXover = 15;
        private  int useYover = 39;
        
        private  StringBuffer codebuffer = new StringBuffer();
        private  StringBuffer one = new StringBuffer();
        private  StringBuffer two = new StringBuffer();
        private  StringBuffer three = new StringBuffer();
        private  StringBuffer four = new StringBuffer();
        
        private  final String er = "00111100011001101100001100000011000001100000110000011000001100000110000011111111";//2
        private  final String san="01111100110001100000001100000110000111000000011000000011000000111100011001111100";//3
        private  final String si="00000110000011100001111000110110011001101100011011111111000001100000011000000110";//4
        private  final String wu="11111110110000001100000011011100111001100000001100000011110000110110011000111100";//5
        private  final String liu="00111100011001101100001011000000110111001110011011000011110000110110011000111100";//6
        private  final String qi="11111111000000110000001100000110000011000001100000110000011000001100000011000000";//7
        private  final String ba="00111100011001101100001101100110001111000110011011000011110000110110011000111100";//8
        private  final String jiu="00111100011001101100001111000011011001110011101100000011010000110110011000111100";//9
        
        private  final Map<String, Integer> codemap = new HashMap<String, Integer>();
        
        {
                codemap.put(er, 2);
                codemap.put(san, 3);
                codemap.put(si, 4);
                codemap.put(wu, 5);
                codemap.put(liu, 6);
                codemap.put(qi, 7);
                codemap.put(ba, 8);
                codemap.put(jiu, 9);
        }
        
        //将图片解析成1，0编码的字符串
        public  String PaseByte(BufferedImage img){
                for(int i=0;i<20;i++){
                        for(int j=0;j<50;j++){
                                //16777216
                                //2565928
                                if((j>=useYstart&&j<=useYover)&&(i>=useXstart&&i<=useXover))
                                if(img.getRGB(j, i)==-2565928){
                                        codebuffer.append("0");
                                }else{
                                        codebuffer.append("1");
                                }
                        }
                        codebuffer.append(",");
                }
                return SplitByte(codebuffer);
        }
        //将字符串拆分为4个单独的1,0编码
        public  String SplitByte(StringBuffer codebuffer){
                for(String s:codebuffer.toString().split(",")){
                        if(s.length()==35){
                                one.append(s.substring(0, 8));
                                two.append(s.substring(9, 17));
                                three.append(s.substring(18, 26));
                                four.append(s.substring(27, 35));
                        }
                }
                return GetCode();
        }
        
        public  String GetCode(){
                return  codemap.get(one.toString())+""+
                                codemap.get(two.toString())+""+
                                codemap.get(three.toString())+""+
                                codemap.get(four.toString());
        }
        
}