Chapter 13 Digital Signatures

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What is the purpose of a digital signature?

To verify the date and time of the message

To hide the contents of the message

To encrypt the message

To authenticate the creator of the message (correct)

What does the digital signature function include?

Only message verification

Both authentication and message verification (correct)

Only authentication function

Only encryption of the message

In a key-only attack, what does the attacker know?

A set of messages and their signatures

The creator's public key (correct)

The creator's private key

The date and time of the signature

What does a known message attack involve?

Choosing a list of messages to attempt to break the signature scheme Signup and view all the answers

What does a generic chosen message attack allow the attacker to do?

Choose messages before attempting to break the signature scheme Signup and view all the answers

How does message authentication protect parties exchanging messages?

By guaranteeing source and integrity of messages from third parties Signup and view all the answers

What is the purpose of performing the signature function first before an outer confidentiality function?

To allow a third party to view the message and its signature in case of dispute Signup and view all the answers

What technique is universally accepted to deal with threats related to the security of a sender's private key?

Utilizing digital certificates and certificate authorities Signup and view all the answers

What primary function is the Digital Signature Standard (DSS) designed to provide?

Only digital signature function Signup and view all the answers

In the RSA approach, what is encrypted using the sender's private key to form the signature?

The hash code of the message Signup and view all the answers

What is a fundamental difference between the Digital Signature Standard (DSS) and RSA approach?

DSS uses public-key techniques but cannot be used for encryption or key exchange Signup and view all the answers

What is the recommended technique for ensuring the security of the sender's private key if it is lost or stolen?

Using digital certificates and certificate authorities Signup and view all the answers

What is a key requirement for a digital signature?

Being easy to verify Signup and view all the answers

Which category does a secure hash function fall into for digital signatures?

Direct Signup and view all the answers

In a direct digital signature scheme, who are the parties involved?

Source and Destination only Signup and view all the answers

How is a digital signature formed in a direct digital signature scheme?

By encrypting the hash code of the message with the sender’s private key Signup and view all the answers

What can provide confidentiality in a digital signature along with the message and signature encryption?

Encrypting the entire message with a symmetric key Signup and view all the answers

Which aspect of a digital signature makes it computationally infeasible to forge?

Use of secure hash functions Signup and view all the answers