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喵喵喵

知识点

lsb低位隐写

图片高度隐藏

NTFS流隐藏文件

uncompyle6 pyc

解题

详细信息 010editor和binwalk大法都没发现什么

上stegsolve

image-20231126194047226

应该是lsb低位隐写,上zsteg看看

image-20231126194507791

修复文件头,发现只显示了一般,修改高度

image-20231126194713700

image-20231126195122970

下载后只有个flag.txt,没有flag,猜测NTFS流隐写

image-20231126195441747

uncompyle6转为python后为

# uncompyle6 version 3.9.0
# Python bytecode version base 2.7 (62211)
# Decompiled from: Python 3.9.8 (tags/v3.9.8:bb3fdcf, Nov  5 2021, 20:48:33) [MSC v.1929 64 bit (AMD64)]
# Embedded file name: flag.py
# Compiled at: 2017-12-05 23:42:15
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']
# okay decompiling flag.pyc

解密脚本为

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(ciphertext):
    flag = ''
    for i, v in enumerate(ciphertext):
        if i % 2 == 0:
            s = int(v) - 10
        else:
            s = int(v) + 10
        flag += chr(s ^ i)
    print(flag)

if __name__ == '__main__':
    decode(ciphertext[::-1])