Rev

1 min read

Writeups for the Reverse Engineering challenges from GPNCTF 2025.

Challenges

  • mini-dsp - Static string extraction from a compiled binary revealing the plaintext flag.
  • The old way - Reversing a 40x40 linear system of simultaneous equations in a cryptographic checker using matrix algebra.

Back to GPNCTF 2025

2 items under this folder.

Terminal

sigsegv@ctf:~/challenges
$ls
[1]incantation/
[2]discord/
[3]operator/
[4]is-this-stego/
[5]gnisrever/
[6]legal-snacks/
[7]todo/
[8]check-it-out/
[9]note-editor/
[10]mini-dsp/
[11]the-old-way/
[12]free-flagging/
[13]intro-to-web-part-1/
[14]intro-to-web-part-2/
[15]intro-to-web-part-3/
[16]intro-to-web-part-4/
[17]real-christmas/
[18]death-by-latex/
[19]help-desk/
[20]hidden-secrets/
[21]patient-zero/
[22]robot-rock/
[23]welcome-home/
[24]whats-up-doc/
[25]i-see-you/
[26]ill-be-reading-that/
[27]operational-oversharing/
[28]the-auditor/
[29]this-seems-odd/
$
Enter # or cmd · 'help' for info