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Foundations of Cryptography

Cryptography

A study of historical and modern cryptographic methods, focusing on cipher types and key cryptographic concepts.

history mathematics computer science

8 Questions Medium Ages 14+ Aug 12, 2026

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About this Study Set

This study set covers Cryptography through 8 practice questions. A study of historical and modern cryptographic methods, focusing on cipher types and key cryptographic concepts. 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 8 questions from the Foundations of Cryptography study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 Which historical cipher method involves shifting each letter in the plaintext by a fixed number of positions down the alphabet?

A Vigenère cipher
B Caesar cipher
C Playfair cipher
D Rail fence cipher

2 What is the primary difference between symmetric and asymmetric encryption?

A Symmetric uses a public key; asymmetric uses no key.
B Symmetric uses the same key for encryption and decryption.
C Asymmetric encryption is always faster than symmetric.
D Symmetric encryption was invented after the internet.

3 During World War II, which electro-mechanical rotor machine was famously used by the German military to encrypt communications?

A Enigma machine
B Purple machine
C SIGABA
D Typex

4 What is a 'polyalphabetic' cipher?

A A cipher that uses only one substitution alphabet.
B A cipher that uses multiple substitution alphabets to obscure patterns.
C A cipher that requires no key to decrypt.
D A cipher that translates letters into binary code only.

5 In the context of the Vigenère cipher, what is the 'keyword' used for?

A To determine the length of the message.
B To dictate the repeating sequence of shifts applied to the plaintext.
C To generate a random prime number for decryption.
D To act as a digital signature for the sender.

6 Which of the following is considered a modern cryptographic hash function?

A SHA-256
B Caesar shift
C Atbash
D Morse code

7 What is the 'frequency analysis' technique primarily used for in classical cryptanalysis?

A To crack codes by counting the occurrence of letters in a ciphertext.
B To measure the speed of an encryption algorithm.
C To determine the strength of a firewall.
D To encrypt files using prime numbers.

8 Which classic cipher replaces pairs of letters (digraphs) rather than single letters?

A Playfair cipher
B Substitution cipher
C ROT13
D Book cipher

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