Cryptography and Security Quiz

What is the primary purpose of cryptography?

• To enhance computer speed

• To make information secret

• To make information public

• To create software programs

What does the term 'cipher' refer to in cryptography?

• A type of computer virus

• An algorithm for converting plain text into ciphertext

• A hardware encryption device

• A method of data storage

What is the Caesar cipher?

• A type of asymmetric encryption

• A substitution cipher used by Julius Caesar

• A modern encryption method

• A key exchange algorithm

What is a drawback of substitution ciphers?

• They are only used in software

• They require a large key size

• They preserve letter frequencies

• They are too complex to use

What is a permutation cipher?

• A cipher that uses multiple keys

• A cipher that encrypts images

• A cipher that rearranges the order of characters

• A cipher that uses random letters

What was the purpose of the German Enigma machine?

• To decode messages

• To create music

• To store data

• To encrypt wartime communications

What is a significant feature of the Enigma machine?

• It had configurable rotors

• It could encrypt letters as themselves

• It used a single rotor

• It was a software-based system

What does DES stand for in cryptography?

• Data Encryption Standard

• Digital Encryption System

• Dynamic Encryption Standard

• Data Encoding System

What is the key size of the original DES?

• 56 bits

• 32 bits

• 64 bits

• 128 bits

What is the main advantage of AES over DES?

• It is faster

• It is easier to implement

• It requires less memory

• It uses larger key sizes