Crypto · Multi-leg · Pwn2Play 2026

CONCORDAT

Three Cold War intercepts — British SIGINT, American case-handling, Soviet cryptography — one week in March 1989. Recover a fragment from each leg and assemble the combined flag at the operator workstation.

Challenge files

Open anything you like.

Playable Intercept A — WAVERLY

MI6 — British SIGINT numbers station (one-time pad).

Playable Intercept B — SOLO

CIA — redacted Station Rome cable.

Playable Intercept C — KURYAKIN

KGB — Soviet Vigenère telegram.

Playable Operator workstation

Assemble the three fragments into the combined flag.

Playable Section III inbox

The discovery inbox that queues the three intercept legs.

Playable Concordat — educational tribute

Background page on the three services (the original entry point).

Download ops/sked.txt

The BBC Y-section watch schedule — the hidden trail.

Writeup Brief

Challenge prompt and objective — non-spoiler.

Writeup · spoiler Solution

Full author walkthrough and the flag.