Unit 3: Asymmetric Key Algorithm and RSA

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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?

Using sender's public key Signup and view all the answers

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

Hard knapsack Signup and view all the answers

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

Each term is greater than the sum of all preceding terms Signup and view all the answers

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

It is more reliable and widely adopted Signup and view all the answers

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

Integrity Signup and view all the answers

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

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

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

Adding privacy, authentication, integrity, and non-repudiation Signup and view all the answers

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

It allows spoofing of the sender's identity Signup and view all the answers

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

Privacy, authentication, integrity, and non-repudiation Signup and view all the answers

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

'Spoofing' of sender's identity by the receiver Signup and view all the answers

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

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

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

By validating the signature using the sender's public key Signup and view all the answers

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

Decrypts the data using sender's private key Signup and view all the answers

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

Enhanced security elements including privacy and integrity Signup and view all the answers

Which element is not provided by a digital signature alone?

Confidentiality Signup and view all the answers

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?

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

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

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?

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?

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?

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?

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?

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

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

Which element is not provided by a digital signature alone?

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