About this Study Set
This study set covers Cryptography through
25 practice questions.
An introduction to the history, methods, and terminology of cryptography suitable for young learners. 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
Cryptography Basics for Teens study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the term for the original, readable message before it is encrypted?
-
A
Ciphertext
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B
Plaintext
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C
Algorithm
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D
Key
2
Which ancient civilization is famously associated with the Caesar cipher?
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A
The Romans
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B
The Egyptians
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C
The Mayans
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D
The Greeks
3
What is the process of converting information into a secret code to prevent unauthorized access?
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A
Decoding
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B
Hashing
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C
Encryption
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D
Decryption
4
In cryptography, what is a 'key' used for?
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A
To lock a physical door
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B
To unlock a smartphone
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C
To transform plaintext into ciphertext and vice versa
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D
To identify the author of a message
5
What is the name of the scrambled, unreadable output produced after encryption?
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A
Ciphertext
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B
Plaintext
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C
Metadata
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D
Protocol
6
Which type of cryptography uses the same key for both encryption and decryption?
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A
Asymmetric
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B
Symmetric
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C
Quantum
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D
Public Key
7
What is the common term for the study of techniques used to break codes and ciphers?
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A
Cryptography
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B
Steganography
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C
Cryptanalysis
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D
Ciphering
8
Which device was famously used by Germany to encrypt messages during World War II?
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A
ENIAC
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B
Enigma
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C
Colossus
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D
Bombe
9
What is the main purpose of a cryptographic hash function?
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A
To compress files
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B
To verify data integrity
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C
To encrypt private emails
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D
To shorten website links
10
What is steganography?
-
A
The study of secret writing
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B
The practice of hiding messages inside other files
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C
The science of cracking codes
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D
The invention of new ciphers
11
In asymmetric encryption, how many keys are involved in the process?
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A
One
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B
Two
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C
Three
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D
Four
12
What does HTTPS stand for in the context of website security?
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A
Hypertext Transfer Protocol Secure
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B
Hypertext Transmission Private Secure
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C
High Transfer Protocol Security
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D
Hyperlink Transfer Protocol System
13
Which of these is a common symmetric encryption algorithm?
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A
RSA
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B
AES
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C
ECC
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D
Diffie-Hellman
14
Who is often referred to as the 'father of computer science' and was a key codebreaker during WWII?
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A
Charles Babbage
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B
Alan Turing
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C
Ada Lovelace
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D
Nikola Tesla
15
What does a digital signature primarily prove?
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A
The message is encrypted
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B
The message was not altered and the sender is authentic
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C
The message can be read by anyone
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D
The message is deleted after reading
16
Which of the following is a classic example of a simple substitution cipher?
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A
Caesar cipher
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B
AES-256
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C
RSA
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D
SHA-256
17
What is 'brute-force' in the context of cryptography?
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A
Trying every possible key until the correct one is found
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B
Breaking the physical computer
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C
Intercepting a message in transit
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D
Writing a mathematical proof
18
Public key cryptography is also known by what other name?
-
A
Private key cryptography
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B
Asymmetric cryptography
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C
Secret key cryptography
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D
Hash cryptography
19
What is the primary function of a 'nonce' in cryptography?
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A
To identify the sender
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B
To provide a unique value to prevent replay attacks
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C
To encrypt the final block of data
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D
To compress the message
20
Which organization is responsible for setting many of the standards used in modern cryptography, such as AES?
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A
NIST
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B
FBI
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C
NASA
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D
UNESCO
21
What is a 'man-in-the-middle' attack?
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A
A type of encryption algorithm
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B
An interception where an attacker sits between two communicating parties
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C
A method to create a digital signature
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D
A way to recover a forgotten password
22
What does the 'S' in TLS (Transport Layer Security) signify?
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A
Speed
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B
Security
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C
Storage
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D
System
23
What is a 'key space' in cryptography?
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A
The amount of memory a computer uses
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B
The set of all possible keys for a specific algorithm
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C
The physical space where keys are stored
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D
The speed at which a key is generated
24
What is the main goal of 'Perfect Forward Secrecy'?
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A
To speed up encryption
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B
To ensure that a compromised long-term key does not compromise past sessions
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C
To make keys easier to remember
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D
To allow users to delete messages
25
What is the term for the practice of making secret messages look like regular, harmless data?
-
A
Encryption
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B
Hashing
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C
Obfuscation
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D
Steganography
