UTCTF 19' Write-up / [basics] forensics

[basics] forensics

100

My friend said they hid a flag in this picture, but it's broken!

by balex

This problem is the last one for the beginner. I downloaded the secret.jpg file, however, I couldn't open it. I just got "file cannot be readable" error message. So I checked the file type on linux environment (Actually, I use WSL, Windows Subsystem for Linux). And then, I found out the file's extension is faked.

$ file secret.jpg
secret.jpg: ASCII text

$ strings secret.jpg
utflag{d0nt_tru5t_f1l3_3xt3ns10n5}

Flag : utflag{d0nt_tru5t_f1l3_3xt3ns10n5}

Reference site : https://utctf.live/challenges#[basics]%20forensics