Buuctf misc-[actf freshman competition 2020]outline

Download the file , Discovered as a tar file （tar Files are often used linux Compressed files on the system ）, Transfer this document to kail

Open the compressed file , For a bunch of strange documents

A... Was found in the compressed file flag.txt And one. mmm.jpg

Open the flag.txt file

Discovery makes us guess once , Judging the question requires us to outguess

Open the other mmm.jpg file

utilize winhex To analyze the picture

Find nothing to use , But I found one exif, You should be prompted to see the picture exif Information

  View the exif Information , It is found that there is a section of socialist core values

It should be encoded with socialist core values

Open the url ：CTF Online tools - Online core values code | Core values coding algorithm |Core Values Encoder (hiencode.com)http://www.hiencode.com/cvencode.html

Decode the core socialist values

It is found that the decoded content is abc

Judge the content as outguess Password

  open kail, Yes, just now txt Document carried out outguess

outguess -k 'abc' -r mmm.jpg flag.txt 

After exporting the steganography , Open again flag.txt You can get the flag：ACTF{gue33_Gu3Ss!2020}

Put it ACTF Change it to flag That's the answer to the question flag

flag{gue33_Gu3Ss!2020}