Buuctf misc-[bjdctf2020] Nani

Download the file , I found that there was only one gif Documents and a txt file

other gif The file could not be opened , The display file is corrupt , Open another txt file

Find nothing to use

adopt winhex To analyze the gif file , Find the file and ask gif file , But it didn't gif The file header of

In the winhex Add in gif The file header of

47 49 46 38

  After successful addition , Then open the gif file , Found as a letter

adopt ps Analyze the frame number

Get a string of letters

Q1RGe3dhbmdfYmFvX3FpYW5nX2lzX3NhZH0=

Judging from the letter format, it is base64 encryption

Use the Xiaokui conversion tool to decrypt it

  Get it flag value

CTF{wang_bao_qiang_is_sad}

modify CTF by flag That's the answer to the question flag

flag{wang_bao_qiang_is_sad}