Famous Codes & Ciphers

About Famous Codes & Ciphers

Code-breaking and cryptography in history Famous Codes & Ciphers packs 15 multiple-choice questions with a mix of 6 easy, 6 medium, 3 hard questions into a relaxed session of roughly 7 minutes — no sign-up, no timer pressure. An explanation appears after every answer, and finishing once a day keeps your streak alive.

A few sample questions

1. 1. What was the name of the German encryption machine that the Allies famously cracked during World War II?

   Answer: Enigma

   The Enigma machine was used by Nazi Germany to encrypt military communications. Breaking the Enigma code at Bletchley Park is estimated to have shortened the war by at least two years.

2. 2. Which British mathematician is credited as the lead figure in cracking the Enigma code?

   Answer: Alan Turing

   Alan Turing led the team at Bletchley Park that cracked the Enigma code. He designed the Bombe machine that could rapidly test possible Enigma settings, and is considered the father of computer science.

3. 3. The Caesar cipher, one of the oldest known encryption methods, was used by which historical figure?

   Answer: Julius Caesar

   Julius Caesar used a simple substitution cipher where each letter was shifted by a fixed number of positions in the alphabet. He typically used a shift of three, so A became D, B became E, and so on.

4. 4. What is the Rosetta Stone, discovered in Egypt in 1799?

   Answer: A stone inscribed with the same text in three scripts

   The Rosetta Stone bears the same decree written in three scripts: Ancient Egyptian hieroglyphs, Demotic script, and Ancient Greek. It was the key to deciphering Egyptian hieroglyphs, primarily by Jean-François Champollion in 1822.

5. 5. What language did the U.S. Marines use as an unbreakable code during World War II in the Pacific?

   Answer: Navajo

   The Navajo Code Talkers used their native language to transmit secret military messages. The Navajo language had no written form and was so complex that the Japanese were never able to crack it.

Things you'll learn along the way

• ✓The Voynich Manuscript is a mysterious illustrated book written in an unknown writing system and language, dated to the early 15th century. Despite intense study by cryptographers, it has never been deciphered.
• ✓Morse code was developed by Samuel Morse and Alfred Vail in the 1830s for use with the electric telegraph. It encodes letters and numbers as sequences of dots and dashes (short and long signals).
• ✓The scytale was used by the ancient Spartans for military communication. A strip of leather was wrapped around a wooden rod of specific diameter, and the message was written across the wound leather. Only someone with a rod of the same size could read it.