18 Questions
What is the purpose of a digital signature?
To authenticate the creator of the message
What does the digital signature function include?
Both authentication and message verification
In a key-only attack, what does the attacker know?
The creator's public key
What does a known message attack involve?
Choosing a list of messages to attempt to break the signature scheme
What does a generic chosen message attack allow the attacker to do?
Choose messages before attempting to break the signature scheme
How does message authentication protect parties exchanging messages?
By guaranteeing source and integrity of messages from third parties
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
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
What primary function is the Digital Signature Standard (DSS) designed to provide?
Only digital signature function
In the RSA approach, what is encrypted using the sender's private key to form the signature?
The hash code of the message
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
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
What is a key requirement for a digital signature?
Being easy to verify
Which category does a secure hash function fall into for digital signatures?
Direct
In a direct digital signature scheme, who are the parties involved?
Source and Destination only
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
What can provide confidentiality in a digital signature along with the message and signature encryption?
Encrypting the entire message with a symmetric key
Which aspect of a digital signature makes it computationally infeasible to forge?
Use of secure hash functions
Explore the concept of digital signatures in public-key cryptography. Learn how digital signatures provide authentication and integrity to messages by using the creator's private key. Understand how the signature is formed by encrypting the message after hashing it.
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