About this Study Set
This study set covers Codes & Ciphers through
25 practice questions.
Explore the fascinating world of secret messages and how they are created and broken, from ancient methods to modern techniques, suitable for young minds curious about cryptography. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 25 questions from the
Decoding the Secrets: Codes & Ciphers Adventure study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the name of a simple cipher where each letter of the alphabet is shifted by a fixed number of positions?
-
A
Substitution Cipher
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B
Caesar Cipher
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C
Transposition Cipher
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D
Vigenère Cipher
2
In a Caesar cipher, if 'A' is shifted by 3 to become 'D', what would 'X' become?
3
What type of cipher involves rearranging the order of letters in a message rather than substituting them?
-
A
Polyalphabetic Cipher
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B
Simple Substitution
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C
Transposition Cipher
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D
Homophonic Substitution
4
The Enigma machine was famously used by which country during World War II to encrypt its messages?
-
A
United States
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B
Soviet Union
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C
Germany
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D
Japan
5
What historical method of communication used a grid and a keyword to write messages, making them harder to decipher?
-
A
Morse Code
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B
Pigpen Cipher
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C
Polybius Square
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D
Playfair Cipher
6
A code where entire words or phrases are replaced by symbols or other words is known as a ____ code.
-
A
Substitution
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B
Cipher
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C
Symbol
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D
Book
7
What is the term for the study of secret writing and secret communication?
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A
Steganography
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B
Cryptography
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C
Ciphrology
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D
Cryptanalysis
8
The Pigpen cipher, also known as the Masonic cipher, uses a grid of symbols based on:
-
A
Shapes of animals
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B
Letters of the alphabet
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C
Musical notes
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D
Numbers
9
When two or more alphabets are used to encrypt a message, making it more complex than a simple substitution, it is called a ____ cipher.
-
A
Monoalphabetic
-
B
Polyalphabetic
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C
Homophonic
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D
Transpositional
10
What is the name of the process of finding the plaintext from a ciphertext without knowing the key?
-
A
Encryption
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B
Decryption
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C
Cryptanalysis
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D
Encoding
11
The 'code talkers' of the Navajo Nation used their native language to create an unbreakable code during which major conflict?
-
A
The American Civil War
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B
World War I
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C
World War II
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D
The Korean War
12
A scytale was an ancient Greek device used for:
-
A
Writing with invisible ink
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B
Transposing messages
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C
Encrypting by substitution
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D
Sending coded signals
13
What is the term for hiding the existence of a message, rather than hiding its content?
-
A
Ciphering
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B
Encoding
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C
Steganography
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D
Code-breaking
14
In a simple substitution cipher, each letter of the alphabet is consistently replaced by another single letter or symbol. This is called a ____ substitution.
-
A
Polyalphabetic
-
B
Homophonic
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C
Monoalphabetic
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D
Periodic
15
What famous mathematician is credited with developing a cipher that used a keyword to create a polyalphabetic substitution?
-
A
Alan Turing
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B
Leon Battista Alberti
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C
Charles Babbage
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D
Augustus De Morgan
16
Morse code is a method of transmitting text that uses a series of short and long signals, known as dots and ____.
-
A
Lines
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B
Dashes
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C
Beeps
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D
Pulses
17
The Vigenère cipher is a type of cipher that uses a ____ to encrypt a message.
-
A
Single alphabet
-
B
Keyword
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C
Numerical sequence
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D
Grid
18
What is the name of the process of converting plaintext into ciphertext?
-
A
Decryption
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B
Cryptanalysis
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C
Encoding
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D
Encryption
19
A simple substitution cipher where the key is the standard English alphabet reversed is called:
-
A
Atbash Cipher
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B
Caesar Cipher
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C
Rail Fence Cipher
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D
Keyword Cipher
20
The practice of hiding a message within another, often innocuous, message is known as:
-
A
Code-breaking
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B
Ciphering
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C
Steganography
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D
Cryptography
21
The Polybius square is a grid used in a type of cipher where letters are represented by their row and ____ coordinates.
-
A
Diagonal
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B
Column
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C
Circle
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D
Triangle
22
What is a 'key' in cryptography?
-
A
A type of code
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B
The algorithm used for encryption
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C
A piece of information needed to decrypt a message
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D
The original message
23
The 'breaking' of a code or cipher is called:
-
A
Encoding
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B
Encrypting
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C
Cryptanalysis
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D
Deciphering
24
Which historical cipher is named after a Roman emperor who used a shift of 3?
-
A
Atbash Cipher
-
B
Caesar Cipher
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C
Playfair Cipher
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D
Vigenère Cipher
25
In a transposition cipher, the letters themselves are not changed, only their ____ is rearranged.
-
A
Meaning
-
B
Frequency
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C
Order
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D
Sound
