Do digital certificates provide non-repudiation?
Digital signatures (combined with other measures) can offer non-repudiation when it comes to online transactions, where it is crucial to ensure that a party to a contract or a communication can’t deny the authenticity of their signature on a document or sending the communication in the first place.
What is confidentiality and non-repudiation?
Non-repudiation provides evidence for the existence of a message or transaction and ensures its contents cannot be disputed once sent. Confidentiality ensures that only the people or processes authorized to view and use the contents of a message or transaction have access to those contents.
When to use HMAC or digital signature for non repudiation?
In other words, we want to adhere to the property of non-repudiation. HMAC is used to provide data integrity and authentication. It doesn’t provide non-repudiation, because it involves using the key, which is shared by communicating entities. Digital signatures are used to provide non-repudiation.
How is the property of non repudiation achieved?
Then, Kevin calculates the hash of the document and compares it to the decrypted digital signature of the document, which is the hash of the document. When those hashes match, Kevin knows who the sender of the message really is, and exactly which message was sent. The property of non-repudiation is achieved by using a digital signature.
How is HMAC used in data integrity and authentication?
When the attacker (man-in-the-middle) changed the document and HMAC, it’d be detected by Kevin: the attacker doesn’t know the key. That way, data integrity and authentication can be verified by Kevin. HMAC is used to provide data integrity and authentication.
When do you use a repudiation attack on a system?
Repudiation Attacks. When a system or application doesn’t include protocols or controls for tracking and logging the actions of its users, the system may be manipulated by malicious intruders, who can forge the identifying credentials of new actions, which can’t be denied with certainty.