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Introduction to Codes and Ciphers

Cryptography

A foundational quiz on the history and mechanics of secret communication systems.

history logic communication
10 Questions Easy Ages 8+ Aug 18, 2026
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About this Study Set

This study set covers Cryptography through 10 practice questions. A foundational quiz on the history and mechanics of secret communication systems. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 10 questions from the Introduction to Codes and Ciphers study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the name of the system where each letter in a message is replaced by a different letter or symbol?
  • A Substitution cipher
  • B Hieroglyphics
  • C Morse code
  • D Binary
2 Which famous historical cipher is named after a Roman leader who used it to protect his military messages?
  • A Alexander cipher
  • B Caesar cipher
  • C Napoleon code
  • D Augustus shift
3 What system uses a series of dots and dashes to represent letters and numbers?
  • A Braille
  • B Semaphore
  • C Morse code
  • D Binary
4 What is the act of turning a secret message back into readable text called?
  • A Encryption
  • B Decoding
  • C Encoding
  • D Translation
5 Which tool uses two concentric circles with letters printed on them to help shift letters for a cipher?
  • A Abacus
  • B Cipher disk
  • C Compass
  • D Slide rule
6 What is the term for the original, readable message before it is turned into a secret code?
  • A Ciphertext
  • B Plaintext
  • C Key
  • D Algorithm
7 In a simple shift cipher, if the shift is 1, what does the letter 'A' become?
  • A B
  • B Z
  • C C
  • D A
8 Which invention used an electric keyboard and rotors to create highly complex encrypted messages during World War II?
  • A Enigma machine
  • B Printing press
  • C Telegraph
  • D Typewriter
9 What is the secret piece of information called that is needed to unlock or solve a coded message?
  • A Password
  • B Key
  • C Hint
  • D Codebook
10 What is the study and practice of writing and solving codes called?
  • A Cryptography
  • B Calligraphy
  • C Cartography
  • D Chronology
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