slug: crypto_one_time_mistake
title: "One-Time Mistake"
description: "The North Pole Secret Agency uses one-time pads for the highest-value messages — or at least they should. While collecting intercepted traffic, Grinch found two ciphertexts that were, unfortunately, encrypted with the same pad. One message looks like a routine operation report (standard template), the other is labelled “CONFIDENTIAL MESSAGE”. The trafficker clearly made a one-time mistake."
category: "crypto"
points: 900
is_visible: true
complexity: 9
attachments:
  - "public/routine_report_template.txt"
  - "public/cipher1.hex"
  - "public/cipher2.hex"
flag_plaintext: "CTF{n3v3r_r3us3_0n3_t1m3_p4d_k3ys!}"