[羊城杯 2020]逃离东南亚
目录
题目链接
解题过程
总结
题目链接
https://buuoj.cn/challenges#[%E7%BE%8A%E5%9F%8E%E6%9D%AF%202020]%E9%80%83%E7%A6%BB%E4%B8%9C%E5%8D%97%E4%BA%9A解题过程
题目是三个压缩包
日记2.zip和日记3.zip需要密码解压。打开日记1.zip，有张png图片。使用010Editor分析，修改图片的高度为300，得到第二个压缩包的密码
解压日记2.zip，结局md文件的提示，打开test文件，看看里面的隐藏信息
这个是BrainFuck编码，早“[”需要添加“++++++++”才能解码，
在线解码 ，得到base64编码
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使用脚本导出到二进制文件
import base64s = 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= base64.b64decode(s)with open('d://result', 'wb') as ff: ff.write(data)在kali里运行这个文件，得到了寂寞。
从wav文件入手吧，用Audacity分析会不会有摩尔密码什么的，结果也没有什么发现。
用SilentEye试试，得到第三个压缩包密码
This1sThe3rdZIPpwd解压日记3.zip，是一堆源代码。md文件里提示有隐写信息。应该使用Tab和空格隐写。
怎么办，这么多的文件。 上脚本吧，发现在三个文件中（elf\rtld.c、malloc\arena.c、malloc\malloc.c'）有隐写信息，都是在“}”后面，长度八位，应该是二进制代码。
import osdef get_file_list(dir_path): _file_list = os.listdir(dir_path) file_list = [] for file_str in _file_list: new_dir_path = dir_path + '\\' + file_str if os.path.isdir(new_dir_path): file_list.extend(get_file_list(new_dir_path)) else: file_list.append(new_dir_path) return file_listdef get_target_file_list(files: list) -> list: target_file_list = [] for file_str in files: f = open(file_str, 'r', encoding='utf-8') try: data = f.read() if ' \t \t' in data: target_file_list.append(file_str) except: pass else: return target_file_listdef bin2asc(string): temp = '' for i in range(int(len(string) / 8)): temp += chr(int(string[i * 8: i * 8 + 8], 2)) return tempdef get_flag(files: list): r = '' for file in files: with open(file, 'r') as ff: for line in ff.readlines(): if '}' in line: index = line.index('}') data = line[index + 1:-1] if '\t' and ' ' in data: t1 = data.replace('\t', '1') t = t1.replace(' ', '0') if len(t) == 8:r += bin2asc(t) r += '\n' else: return rif __name__ == '__main__': files_list = get_file_list(r'C:\Users\Administrator\Desktop\逃离东南亚\日记3\source_code') flag = get_flag(get_target_file_list(files_list)) print(flag)最后得到flag
flag{code_steganography_1s_funny!}
总结
1.思路：通过前一个压缩包信息解压下一个压缩包。再从MD文件获取信息，得到结果。
2.知识点：png隐写、wav隐写、不可见字符隐写。