Introduction and History of Cryptography ECES Practice Questions (Page 5)

Questions 21–25

1. 21expert · hard

   A cybersecurity historian is writing an article about the transition from classical to modern cryptography. The historian wants to emphasize the role of information theory in formalizing the security of encryption systems. Which contribution should the historian highlight as the foundational work that bridged classical and modern cryptography?

   • AAlan Turing's design of the Bombe
   • BClaude Shannon's 'Communication Theory of Secrecy Systems'
   • CThe invention of the one-time pad
   • DAl-Kindi's manuscript on frequency analysis
   Reveal Solution Discussion Select an answer first
2. 22application · medium

   A museum curator is designing an exhibit on ancient cryptography. The curator wants to include an example of a transposition cipher used by the Spartans. Which artifact should be featured?

   • AA keyword square used for the Vigenère cipher.
   • BA wooden rod and a strip of parchment, illustrating the scytale.
   • CA disk with two rotating alphabets, illustrating the Caesar cipher.
   • DA table of the Atbash alphabet mapping.
   Reveal Solution Discussion Select an answer first
4. 23expert · hard

   A university course is comparing the contributions of Alan Turing and Claude Shannon to modern cryptography. The instructor wants to highlight how their work addressed different aspects of cryptography. Which statement best contrasts their contributions?

   • ATuring introduced the concept of confusion, while Shannon introduced the concept of diffusion
   • BTuring invented the first block cipher, while Shannon invented the first stream cipher
   • CTuring developed the one-time pad, while Shannon proved its insecurity
   • DTuring focused on practical cryptanalysis of specific ciphers, while Shannon developed a general theoretical framework for encryption security
   Reveal Solution Discussion Select an answer first
5. 24application · medium

   A university professor is teaching a module on the theoretical foundations of modern cryptography. The professor wants to highlight the researcher who introduced the concepts of confusion and diffusion, which are now fundamental to the design of block ciphers. Which figure should the professor emphasize?

   • AAl-Kindi
   • BAuguste Kerckhoffs
   • CAlan Turing
   • DClaude Shannon
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   What was a key limitation of early substitution ciphers that led to the development of more sophisticated techniques?

   • AThey were vulnerable to frequency analysis because each letter was consistently mapped to the same ciphertext letter
   • BThey required too much computational power to encrypt and decrypt
   • CThey could only encrypt numbers, not letters
   • DThey were too fast to be secure
   Reveal Solution Discussion Select an answer first