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Misc (eternal night), the preliminary competition of the innovation practice competition of the National College Students' information security competition
2022-07-06 02:41:00 【Like to drink Wangzai's Wangwang】
The tense final is finally over , I just have time to sum up one of the competitions some time ago misc subject , Layers of dolls are very interesting .
Title Attachment :
link :https://pan.baidu.com/s/1lZ6YCyyY3hdMx2_ymLlsyA
Extraction code :viy2
-- From Baidu network disk super member V1 The share of
Get the picture , The old rules use 010 Open file :
A string of abnormal data is found at the end of the file
Question prompt this question is lsb Steganography
Use the tool to analyze the color trace of the picture
In this color channel, I found a string of things similar to moss code
Analyze the file corresponding to the color track and find this string of ciphertext
The title also suggests a little use password Of lsb Steganography , Associated with the github Last project cloacked-pixel
Project address :GitHub - livz/cloacked-pixel: LSB steganography and detection
utilize a2 The information in the channel is read out, and the hidden information is output as a txt file
open txt file
pk The file header Obviously compressed package Change the suffix of the file to zip Prompt for password
At this time, we think of the last string of data in the picture at the beginning Try various decryption methods Last use md5 figure out
Get the final decompression password
decompression Get a picture
Unable to open The prompt file is corrupt
The conventional thinking here is based on crc Explode the correct width and height of the picture , Let the picture parse normally . Here is a more ingenious way
Change the picture name to flag.data Reuse gimp Open the picture Adjust the width to get the final flag
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