Introduction and History of Cryptography ECES Practice Questions (Page 9)

Questions 41–44

1. 41foundation · easy

   Which historical period is associated with the invention of the Enigma machine?

   • AThe early 20th century
   • BThe Renaissance
   • CThe Digital Age (post-1970s)
   • DAncient Greece
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2. 42foundation · easy

   What is Alan Turing best known for in the field of cryptography?

   • AInventing the first public-key cryptosystem
   • BCreating the Data Encryption Standard (DES)
   • CLeading the team that broke the German Enigma machine's codes during World War II
   • DDeveloping frequency analysis to break monoalphabetic ciphers
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4. 43foundation · easy

   How did the advent of computer-based encryption change cryptography compared to classical methods?

   • AIt made all encryption unbreakable
   • BIt eliminated the need for keys in encryption
   • CIt replaced all substitution ciphers with transposition ciphers
   • DIt allowed for the use of much longer keys and more complex algorithms that are infeasible to break by hand
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5. 44application · medium

   A cryptography course instructor wants to demonstrate the historical breakthrough that made polyalphabetic ciphers more secure than monoalphabetic ones. Which example should the instructor use?

   • AThe Atbash cipher, which reverses the alphabet.
   • BThe Vigenère cipher, which uses a keyword to shift letters differently at each position.
   • CThe Spartan scytale, which uses a rod for transposition.
   • DThe Caesar cipher, which shifts each letter by a fixed amount.
   Reveal Solution Discussion Select an answer first