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Questions and Answers
What additional security features does a digital signature provide apart from non-repudiation?
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?
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?
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?
How does the receiver verify the authenticity of a digital signature in a sign-then-encrypt system?
In Knapsack Encryption Algorithm, which knapsack problem is used as the public key?
In Knapsack Encryption Algorithm, which knapsack problem is used as the public key?
What characterizes a super increasing knapsack problem in Knapsack Encryption Algorithm?
What characterizes a super increasing knapsack problem in Knapsack Encryption Algorithm?
Why is encrypt-then-sign method preferred over sign-then-encrypt in digital communications?
Why is encrypt-then-sign method preferred over sign-then-encrypt in digital communications?
What security feature does a digital signature provide apart from non-repudiation?
What security feature does a digital signature provide apart from non-repudiation?
In a digital signature scheme, what happens if an attacker modifies the data before it reaches the receiver?
In a digital signature scheme, what happens if an attacker modifies the data before it reaches the receiver?
What role does public-key encryption play in a digital signature scheme?
What role does public-key encryption play in a digital signature scheme?
Why is the 'sign-then-encrypt' method not preferred in combining digital signatures with encryption?
Why is the 'sign-then-encrypt' method not preferred in combining digital signatures with encryption?
What element of security is achieved by combining digital signatures with encryption?
What element of security is achieved by combining digital signatures with encryption?
In a sign-then-encrypt system, what is the risk associated with the 'sign-then-encrypt' approach?
In a sign-then-encrypt system, what is the risk associated with the 'sign-then-encrypt' approach?
What distinguishes a super increasing knapsack problem in Knapsack Encryption Algorithm?
What distinguishes a super increasing knapsack problem in Knapsack Encryption Algorithm?
How does the verifier ensure message authenticity when validating a digital signature?
How does the verifier ensure message authenticity when validating a digital signature?
What does the receiver do after verifying the digital signature in a 'encrypt-then-sign' system?
What does the receiver do after verifying the digital signature in a 'encrypt-then-sign' system?
What is achieved by combining digital signatures with encryption in a cryptosystem?
What is achieved by combining digital signatures with encryption in a cryptosystem?
Which element is not provided by a digital signature alone?
Which element is not provided by a digital signature alone?
