CTF之 MD5 爆破两个例子

淡淡的烟草味﹌ 2022-05-28 23:53 487阅读 0赞

有两个例子,一个是知道组成的字符为数字,然后知道加盐后的MD5,求组成的字符
    第二个是知道字符长度为0-6,然后给出字符集,用暴力的办法解出该MD5字符
    下面就是两个例子了,下次遇着类似的继续备之

import hashlib
    
    import string
    
    
    def crackMd5(dst):
        dst = dst.lower()
    
        for a in range(0,10):
    
            for b in range(0,10):
    
                for c in range(0,10):
    
                    for d in range(0,10):
    
                        word = str(a) + str(b) + str(c) + str(d) + "_heetian"
    
                        tmp = hashlib.md5(word).hexdigest()
    
                        if dst == tmp:
                            return word
    
        return None
    
    
    if __name__ == "__main__":
        raw_input(crackMd5("158e64cfc9991940700acc5dc0f310e3"))

例子2:不确定长度

# -*- coding:utf-8 -*-
    __author__ = 'Administrator'
    #from ultrapower.fd
    import itertools as its
    import md5
    
    #暴力破解
    def uncipher(maxlenth,salt,ciphertext_s,str_letter):
      ciphertext_s=ciphertext_s
      salt = salt
      maxlenth=int(maxlenth)
      str_letter=str_letter
      ciphertext=''
      for i in range(1, maxlenth+1):
        # 迭代生成明文(例如abc,repeat=2 结果为（a,a)(a,b)(a,c)(b,b)(b,a)(b,c)(c,c)(c,a)(c,b)
        r = its.product(str_letter, repeat=i)
        for j in r:
          plaintext = "".join(j) #连接成字符串
          plaintext = "%s%s" % (plaintext, salt)  #把盐加到明文的后面 每次生成的最终明文
          #print plaintext #打印明文
          # 开始解密，方法是，每个明文进来，加密成密文，然后密文与密文做对比
          md501 = md5.new()
          md501.update(plaintext)
          ciphertext = md501.hexdigest()
          # 对比密文确认明文
          if ciphertext == ciphertext_s:  #如果密文一致 退出2层循环
            break
        if ciphertext == ciphertext_s:    #如果密文一致，退出1层循环，打印结果
          print "task finished(plain,cipher)"
          print "%s:%s" % (plaintext, ciphertext) #打印结果
          break
    
    #开始执行主函数
    #str_letter="abcdefghijklmnopqrstuvwxyz0123456789"
    #str_letter="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
    #str_letter="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
    str_letter="abcdefghijklmnopqrstuvwxyz"   #明文的字符范围
    maxlenth=6   #明文的最大长度,一般不会超过6位，否则短时间很难暴力破解
    salt='5948'  #加盐 #如果不加盐，为空就是正常的md5解密
    ciphertext_s='81bdf501ef206ae7d3b92070196f7e98'     #密文
    uncipher(maxlenth,salt,ciphertext_s,str_letter)     #开始解密