Solving CTF Challenges Through Reverse Engineering and Linear Algebra
Binary Analysis with IDA Pro
When analyzing check_in.exe, the following key observations were made:
The program requires flag.jpg as input
It performs XOR operations between file contents and a hardcoded key
Output is written to hint.txt
// Simplified decompiled code snippet
void process_file() {
FILE *input = fopen("flag.jpg", ...
Posted on Fri, 30 Oct 2026 16:30:04 +0000 by eric_e