18 Questions
What additional security features does a digital signature provide apart from non-repudiation?
Message authentication and data integrity
How does the verifier ensure message authenticity when validating a digital signature?
By using the sender's public key
What happens if an attacker modifies the data before it reaches the receiver in a digital signature scheme?
The digital signature verification fails
How does the receiver verify the authenticity of a digital signature in a sign-then-encrypt system?
Using sender's public key
In Knapsack Encryption Algorithm, which knapsack problem is used as the public key?
Hard knapsack
What characterizes a super increasing knapsack problem in Knapsack Encryption Algorithm?
Each term is greater than the sum of all preceding terms
Why is encrypt-then-sign method preferred over sign-then-encrypt in digital communications?
It is more reliable and widely adopted
What security feature does a digital signature provide apart from non-repudiation?
Integrity
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
What role does public-key encryption play in a digital signature scheme?
Adding privacy, authentication, integrity, and non-repudiation
Why is the 'sign-then-encrypt' method not preferred in combining digital signatures with encryption?
It allows spoofing of the sender's identity
What element of security is achieved by combining digital signatures with encryption?
Privacy, authentication, integrity, and non-repudiation
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
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
How does the verifier ensure message authenticity when validating a digital signature?
By validating the signature using the sender's public key
What does the receiver do after verifying the digital signature in a 'encrypt-then-sign' system?
Decrypts the data using sender's private key
What is achieved by combining digital signatures with encryption in a cryptosystem?
Enhanced security elements including privacy and integrity
Which element is not provided by a digital signature alone?
Confidentiality
Learn about asymmetric key algorithms, digital signatures, and RSA encryption. Understand how public and private keys play a role in encryption and decryption processes. Explore the advantages and disadvantages of asymmetric encryption methods.
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