Introduction to Cryptography with Dr. Khalid Javeed
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Questions and Answers

What is the most fundamental problem that cryptography addresses?

  • Ensuring the security of communication over an insecure medium (correct)
  • Ensuring the reliability of communication over a secure medium
  • Ensuring the speed of communication over a secure medium
  • Ensuring the anonymity of communication over an insecure medium

What does 'confidentiality' mean in the context of secure communication?

  • Only the intended recipient can see the communication (correct)
  • The communication is generated by the alleged sender
  • The adversary can eavesdrop on the communication
  • The adversary has full control over the communication channel

What does 'integrity' mean in the context of secure communication?

  • The adversary can eavesdrop on the communication
  • The adversary has full control over the communication channel
  • Only the intended recipient can see the communication
  • The communication is generated by the alleged sender (correct)

What are the two possibilities for an insecure medium according to cryptography?

<p>Passive attacker: the adversary can eavesdrop; Active attacker: the adversary has full control over the communication channel (A)</p> Signup and view all the answers

What does 'steganography' rely on to hide the existence of a message?

<p>Secrecy of method (D)</p> Signup and view all the answers

What does 'cryptography' rely on to hide the meaning of a message?

<p>Secrecy of a short key, not method (C)</p> Signup and view all the answers

What is the security goal that ensures a message really originated from Alice?

<p>Data authenticity (C)</p> Signup and view all the answers

Which security goal prevents an adversary from reading message M?

<p>Data privacy (B)</p> Signup and view all the answers

What does non-repudiation refer to in the context of cryptography?

<p>Tracing actions of an entity uniquely to that entity (B)</p> Signup and view all the answers

Which term describes the assurance that private or confidential information is not made available to unauthorized individuals?

<p>Confidentiality (A)</p> Signup and view all the answers

What is the primary function of digital signatures in secure communication?

<p>Ensuring non-repudiation (D)</p> Signup and view all the answers

Which cryptographic method is also known as public-key encryption?

<p>Asymmetric keys (B)</p> Signup and view all the answers

'Cryptography' relies on transforming an intelligible message into one that is unintelligible and retransforming it back. What does this process ensure?

<p>Confidentiality (A)</p> Signup and view all the answers

'Cryptography' relies on transforming an intelligible message into one that is unintelligible and retransforming it back. What does this process ensure?

<p>Confidentiality (D)</p> Signup and view all the answers

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