#coding=utf-8
import zlib
import struct
#读文件
file = '1.png'  #注意，1.png图片要和脚本在同一个文件夹下哦~
fr = open(file,'rb').read()
data = bytearray(fr[12:29])
crc32key = eval(str(fr[29:33]).replace('\\x','').replace("b'",'0x').replace("'",''))
#crc32key = 0xCBD6DF8A #补上0x，copy hex value
#data = bytearray(b'\x49\x48\x44\x52\x00\x00\x01\xF4\x00\x00\x01\xF1\x08\x06\x00\x00\x00')  #hex下copy grep hex
n = 4095 #理论上0xffffffff,但考虑到屏幕实际，0x0fff就差不多了
for w in range(n):#高和宽一起爆破
    width = bytearray(struct.pack('>i', w))#q为8字节，i为4字节，h为2字节
    for h in range(n):
        height = bytearray(struct.pack('>i', h))
        for x in range(4):
            data[x+4] = width[x]
            data[x+8] = height[x]
            #print(data)
        crc32result = zlib.crc32(data)
        if crc32result == crc32key:
            print(width,height)
            #写文件
            newpic = bytearray(fr)
            for x in range(4):
                newpic[x+16] = width[x]
                newpic[x+20] = height[x]
            fw = open(file+'.png','wb')#保存副本
            fw.write(newpic)
            fw.close

with open('hex.txt', 'r') as h:     # hex.txt为要转换的文本文件
    val = h.read()
    h.close()

with open('result.txt', 'w') as re: # 转换完成后写入result.txt
    tem = ''
    for i in range(0, len(val), 2):
        tem = '0x' + val[i] + val[i+1]
        tem = int(tem, base=16)
        print(chr(tem), end="")
        re.write(chr(tem))
    re.close()

with open('result.txt', 'r') as res:  # 坐标格式文件比如(7,7)
    re = res.read()
    res.close()
    
with open('gnuplotTxt.txt', 'w') as gnup:   # 将转换后的坐标写入gnuplotTxt.txt
    re = re.split()
    tem = ''
    for i in range(0, len(re)):
        tem = re[i]
        tem = tem.lstrip('(')
        tem = tem.rstrip(')')
        for j in range(0, len(tem)):
            if tem[j] == ',':
                tem = tem[:j] + ' ' + tem[j+1:]
        gnup.write(tem + '\n')
    gnup.close()

alphabet = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()_+- =\\{\\}[]"
strings = open('flag.txt').read()

result = {}
for i in alphabet:
	counts = strings.count(i)
	i = '{0}'.format(i)
	result[i] = counts

res = sorted(result.items(),key=lambda item:item[1],reverse=True)
for data in res:
	print(data)

for i in res:
	flag = str(i[0])
	print(flag[0],end="")
# 代码来自：mochu7
# https://blog.csdn.net/mochu7777777/article/details/109377328

#!/usr/bin/env python
# Version: Python 2.7

import base64

def encode():
    flag = '*************'
    ciphertext = []
    for i in range(len(flag)):
        s = chr(i ^ ord(flag[i]))
        if i % 2 == 0:
            s = ord(s) + 10
        else:
            s = ord(s) - 10
        ciphertext.append(str(s))
    
    return ciphertext[::-1]

ciphertext = [
    '96',
    '65',
    '93',
    '123',
    '91',
    '97',
    '22',
    '93',
    '70',
    '102',
    '94',
    '132',
    '46',
    '112',
    '64',
    '97',
    '88',
    '80',
    '82',
    '137',
    '90',
    '109',
    '99',
    '112']

def decode(arg1):
	ciphertext = arg1[::-1]
	flag = ''
	for i in range(len(ciphertext)):
		if i % 2 == 0:
			s = int(ciphertext[i]) - 10
		else:
			s = int(ciphertext[i]) + 10 
		s = s ^ i
		flag += chr(s)
	print(flag)

if __name__ == '__main__':
	ciphertext = [
        '96', '65', '93', '123', '91', '97', '22', '93', '70', '102', '94', '132', '46', '112', '64', '97', '88', '80', '82', '137', '90', '109', '99', '112'
    ]
	decode(ciphertext)

import base64

def int2Bin(digit):
	return bin(digit)[2:]	#将索引转成二进制，去掉'0b';


def binAsc(string):		#二进制转成ASCII码
	temp = ''
	for i in range(int(len(string) / 8)):
		temp += chr(int(string[i * 8 : i* 8 + 8] , 2))
	return temp

def readBase64FromFile(filename):
	Base64Char = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"     #Base64字符集 已按照规范排列
	result = ''
	with open(filename ,'r') as f:
		for data in f.readlines():
			if data.find('==') > 0:
				result += int2Bin(Base64Char.index(data[-4]))[-4:]		#根据隐写原理，‘==’情况取等号前最后一个字符转换后取后4位
			elif data.find('=') > 0:
				result += int2Bin(Base64Char.index(data[-3]))[-2:]		#根据隐写原理，‘=’情况取等号前最后一个字符转换后取后2位
	print(binAsc(result))

readBase64FromFile('flag.txt')
原文链接：https://blog.csdn.net/wangjin7356/article/details/122237992