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全国大学生信息安全赛创新实践赛初赛---misc(永恒的夜)
2022-07-06 02:36:00 【爱喝旺仔的旺旺】
紧张的期末总算结束了,正好有时间总结一下前段时间比赛的一个misc题目,层层套娃非常有意思。
题目附件:
链接:https://pan.baidu.com/s/1lZ6YCyyY3hdMx2_ymLlsyA
提取码:viy2
--来自百度网盘超级会员V1的分享
拿到图片,老规矩用010打开文件:
在文件的最后发现一串异常的数据
题目提示这个题是lsb隐写
上工具分析一下图片的色道
在这个色道发现了一串类似摩斯密码的东西
分析对应色道的文件找到这串密文
题目还提示了一点使用password的lsb隐写,联想到github上的一个项目cloacked-pixel
项目地址:GitHub - livz/cloacked-pixel: LSB steganography and detection
利用a2通道当中的信息读取出当中隐藏的信息输出为一个txt文档
打开txt文档
pk文件头 明显为压缩包 修改文件后缀为zip 提示有密码
这时我们联想到一开始图片最后的那串数据 尝试各种解密方式 最后用md5解出
得到最后的解压密码
解压 得到一张图片
无法打开 提示文件损坏
这里常规思路是根据crc爆破出图片的正确宽高,让图片正常解析。这里用了一个比较取巧的方式
修改图片名为flag.data 再用gimp打开图片 调整宽度即可得到最后的flag
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