Public Key Encryption Lecture Recap
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Questions and Answers

What is the main disadvantage of the Diffie–Hellman key exchange protocol?

  • It is computationally inefficient
  • It does not provide any privacy guarantees
  • It is vulnerable to brute force attacks
  • It requires both parties to be available online (correct)

What is the key factor that determines if an eavesdropper can learn anything about the final key in the Diffie–Hellman protocol?

  • CDH assumption (correct)
  • DDH assumption
  • Length of the keys
  • Encryption algorithm used

Why does the CDH assumption play a crucial role in determining privacy in the Diffie–Hellman protocol?

  • It ensures the security of the encryption keys
  • It speeds up the key exchange process
  • It prevents adversaries from gaining knowledge of the resultant key (correct)
  • It guarantees the confidentiality of the communication

In a public-key cryptosystem, what is the purpose of the secret key (sk) generated by the receiver?

<p>To decrypt messages (B)</p> Signup and view all the answers

What characteristic distinguishes public-key cryptosystems from symmetric-key cryptographic primitives?

<p>Multiple keys are generated in public-key cryptosystems (A)</p> Signup and view all the answers

Why did Diffie and Hellman propose a new encryption process known as public-key cryptosystem?

<p>To address the spontaneity issues of email applications caused by traditional key exchange protocols (B)</p> Signup and view all the answers

What distinguishes public-key encryption from symmetric-key encryption in terms of key distribution?

<p>Public keys are usually shared publicly in public-key encryption. (D)</p> Signup and view all the answers

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