Unit 3: Asymmetric Key Algorithm and RSA - Introduction
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Questions and Answers

What additional security features does a digital signature provide apart from non-repudiation?

  • Message authentication and data integrity (correct)
  • Authorization and privacy
  • Availability and authenticity
  • Confidentiality and integrity

    • How does the verifier ensure message authenticity when validating a digital signature?

  • By using the sender's public key (correct)
  • By using the receiver's public key
  • By using the receiver's private key
  • By using the sender's private key

    • What happens if an attacker modifies the data before it reaches the receiver in a digital signature scheme?

  • The data integrity is improved
  • The receiver loses the ability to deny the message
  • The receiver can still decrypt the modified data
  • The digital signature verification fails (correct)

    • How does the receiver verify the authenticity of a digital signature in a sign-then-encrypt system?

    <p>Using sender's public key</p> Signup and view all the answers

    In Knapsack Encryption Algorithm, which knapsack problem is used as the public key?

    <p>Hard knapsack</p> Signup and view all the answers

    What characterizes a super increasing knapsack problem in Knapsack Encryption Algorithm?

    <p>Each term is greater than the sum of all preceding terms</p> Signup and view all the answers

    Why is encrypt-then-sign method preferred over sign-then-encrypt in digital communications?

    <p>It is more reliable and widely adopted</p> Signup and view all the answers

    What security feature does a digital signature provide apart from non-repudiation?

    <p>Integrity</p> Signup and view all the answers

    In a digital signature scheme, what happens if an attacker modifies the data before it reaches the receiver?

    <p>The receiver can safely deny the message due to failed verification</p> Signup and view all the answers

    What role does public-key encryption play in a digital signature scheme?

    <p>Adding privacy, authentication, integrity, and non-repudiation</p> Signup and view all the answers

    Why is the 'sign-then-encrypt' method not preferred in combining digital signatures with encryption?

    <p>It allows spoofing of the sender's identity</p> Signup and view all the answers

    What element of security is achieved by combining digital signatures with encryption?

    <p>Privacy, authentication, integrity, and non-repudiation</p> Signup and view all the answers

    In a sign-then-encrypt system, what is the risk associated with the 'sign-then-encrypt' approach?

    <p>'Spoofing' of sender's identity by the receiver</p> Signup and view all the answers

    What distinguishes a super increasing knapsack problem in Knapsack Encryption Algorithm?

    <p>'Super increasing' property where each term is greater than the sum of preceding terms</p> Signup and view all the answers

    How does the verifier ensure message authenticity when validating a digital signature?

    <p>By validating the signature using the sender's public key</p> Signup and view all the answers

    What does the receiver do after verifying the digital signature in a 'encrypt-then-sign' system?

    <p>Decrypts the data using sender's private key</p> Signup and view all the answers

    What is achieved by combining digital signatures with encryption in a cryptosystem?

    <p>Enhanced security elements including privacy and integrity</p> Signup and view all the answers

    Which element is not provided by a digital signature alone?

    <p>Confidentiality</p> Signup and view all the answers

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