flag checker everyone loves
Beginner Hint
- This challenge is in the Rev (Reverse Engineering) category.
- Flag checkers are a common theme in Rev problems.
- A flag checker executable or script accepts player input and tells you whether it matches the flag.
- The provided files are the C source
challenge.cand its Ubuntu 24.04 binary buildchallenge. - In
challenge.c, the flag-related stringxor_flaghas been edited out and hidden. - The goal is to use
challenge.cas a reference and find an input (the flag) that makes thechallengebinary printCorrect. - Typically Rev problems don't include source code. You usually analyze only the binary. This one can also be solved without the source.