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Cryptography Essentials

Cryptography

A collection of foundational facts regarding the field of cryptography and data security.

security history math computing

15 Questions Easy Ages 12+ Jul 22, 2026

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About this Study Set

This study set covers Cryptography through 15 practice questions. A collection of foundational facts regarding the field of cryptography and data security. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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1 What is the primary purpose of cryptography?

A To increase file size
B To secure communication and information
C To speed up internet connections
D To delete data permanently

2 Which term refers to the process of turning readable information into unreadable code?

A Decoding
B Encryption
C Compression
D Hashing

3 What is the readable, original message before it is encrypted called?

A Ciphertext
B Plaintext
C Metadata
D Key

4 In cryptography, what is a 'key' used for?

A To physically lock a computer
B To perform encryption and decryption algorithms
C To reset a forgotten password
D To connect to Wi-Fi

5 What is the name for the encrypted, unreadable version of a message?

A Plaintext
B Ciphertext
C Source code
D Binary

6 Which of these is a historical method of encryption using letter shifting?

A Caesar cipher
B Morse code
C Binary encoding
D Base64

7 What does the 'S' in HTTPS stand for?

A System
B Secure
C Standard
D Server

8 Symmetric encryption relies on which of the following?

A One shared secret key
B Multiple public keys
C No keys at all
D Random password generation

9 Which mathematical field is fundamental to modern cryptography?

A Biology
B Number theory
C Architecture
D Linguistics

10 What is a 'hash function' in cryptography commonly used for?

A Converting text into images
B Verifying data integrity
C Increasing data storage space
D Compressing video files

11 Which type of cryptography uses a public key and a private key?

A Asymmetric encryption
B Symmetric encryption
C Simple substitution
D Monoalphabetic cipher

12 The Enigma machine was famously used during which historical period?

A The Industrial Revolution
B World War II
C The Space Race
D The Cold War

13 What does the process of 'decryption' perform?

A Converts ciphertext back to plaintext
B Converts plaintext to ciphertext
C Deletes the encryption key
D Adds a digital signature

14 Which of the following is a common hashing algorithm?

A SHA-256
B AES
C RSA
D Caesar

15 What is a 'digital signature' used to verify?

A The size of a file
B The authenticity and integrity of a message
C The internet speed
D The user's password

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