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Introduction to Cryptography

Cryptography

Foundational concepts of encryption, historical methods, and modern security principles.

computer science security math history

15 Questions Easy Ages 14+ Oct 4, 2026

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About this Study Set

This study set covers Cryptography through 15 practice questions. Foundational concepts of encryption, historical methods, and modern security principles. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 15 questions from the Introduction to Cryptography study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the term for the process of converting readable information into an unreadable format?

A Decryption
B Encryption
C Hashing
D Authentication

2 Which historical cipher involves shifting letters of the alphabet by a fixed number of positions?

A Caesar cipher
B Vigenère cipher
C RSA algorithm
D AES

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

A Ciphertext
B Key
C Plaintext
D Metadata

4 In symmetric-key cryptography, how many keys are used to both encrypt and decrypt the data?

A Zero
B One
C Two
D Three

5 What is the primary purpose of a digital signature in network security?

A To hide the message content
B To speed up data transmission
C To verify the authenticity and integrity of a message
D To compress large files

6 Which of these is a widely used symmetric encryption algorithm?

A RSA
B AES
C Diffie-Hellman
D ECC

7 What does the 'A' in the RSA encryption algorithm stand for?

A Adleman
B Algorithm
C Advanced
D Authentication

8 Which type of cryptography uses a public key for encryption and a private key for decryption?

A Symmetric cryptography
B Asymmetric cryptography
C Hash-based cryptography
D Steganography

9 What is the main goal of a 'hash function' in data security?

A To reverse encrypted data
B To provide a unique fixed-length string representation of data
C To compress images
D To translate languages

10 What is 'ciphertext' in the context of cryptography?

A The raw data input
B The encoded or encrypted version of the data
C The key used to unlock a file
D A secure network protocol

11 Which of these is a common weakness of a simple Caesar cipher?

A It requires very long keys
B It is immune to frequency analysis
C It has a very small number of possible keys
D It uses too much memory

12 What is the practice of hiding information within other non-secret data, such as an image?

A Steganography
B Decryption
C Encryption
D Hashing

13 Which cryptographic technique is used to ensure data has not been altered during transmission?

A Data compression
B Integrity checking (Hashing)
C Data masking
D Key rotation

14 Who is meant to have access to a private key in an asymmetric system?

A The general public
B Only the recipient of the message
C Everyone on the network
D The network administrator only

15 What is the definition of a 'cryptographic key'?

A A physical key for a server room
B A piece of information used to control the encryption and decryption process
C A password for a user account
D A hardware firewall

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