MB-CTF

// INTERCEPTED TRANSMISSION — ORIGIN UNKNOWN //

--Days

--Hours

--Min

--Sec

Status: ACTIVE

Difficulty: CLASSIFIED

Category: SIGINT / CRYPTO

Reward: VALUABLE GIFT 🎁

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Mission Briefing

Eyes only — read then destroy

$ sys.init — CTF-INTEL-01 ... [OK] Secure channel established [OK] Encryption layer: ACTIVE [INTEL] An encrypted transmission was intercepted over the air. [INTEL] Transmitting encrypted messages over the airwaves is ILLEGAL. [INTEL] However, posting encrypted messages on the web is fair game. [MISSION] You are tasked with: 1. Intercepting and listening to the WAV transmission below 2. Decoding the message using your signals intelligence 3. Transmitting the decrypted payload to the operator [REWARD] A valuable gift awaits the first agent to crack this. [WARNING] Nobody has solved this yet. Think you can? $

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Intercepted Transmission

Signal recorded — duration 55.9s — mono 8kHz

READY TO PLAY TRANSMISSION_001.WAV

0:00 / 0:55

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Intel Fragments

Reveal at your own discretion — each hint is a clue, not a shortcut

The transmission uses an analog encoding scheme invented in the 1830s. Originally used for telegraphy. Think dots and dashes.

Once decoded, the message is 64 hexadecimal characters. The character set is 0-9 and A-F. Submit the full string exactly as decoded.

The payload is consistent with a SHA-256 hash function output. 256 bits = 32 bytes = 64 hex chars. This is your final answer — no further decryption needed.

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Submit Decrypted Payload

Transmit your answer to the operator — correct answer earns a gift