[CTF] WU - Code and Machine

Difficulty Level : Very Easy

Challenge Category : OSINT

Description :

During the Second World War, a genius cryptographer worked on deciphering a secret code used by a revolutionary machine. His innovation was a device that accelerated decryption and made history.
format: FLAG{Firstname_Name_Device_year}

Solution Steps

Step 1: Analyze the Challenge Description

The challenge provides key historical clues:

1. Second World War: The timeline points to major historical events.
2. Genius Cryptographer: Refers to an individual renowned for their cryptographic work.
3. Revolutionary Machine: Likely used for encrypted communication during the war.
4. Decryption Device: A tool or invention that accelerated decryption and changed history.

Step 2: Research Key Elements

Using the provided clues, a quick internet search leads us to the Enigma machine, a German encryption device used during World War II.

The cryptographer referenced is Alan Turing, who:

1. Played a key role in breaking the Enigma cipher.
2. Invented the Bombe, an electromechanical machine designed to accelerate decryption.

Step 3: Construct the Flag

From our research:

• Firstname: Alan
• Name: Turing
• Device: Bombe
• Year: 1940s (The Bombe was first operational in 1940).

Final Flag:

FLAG{Alan_Turing_Bombe_1940}