From a cryptographic perspective, the service of non-repudiation includes which of the following features?

Question

Options

• AValidity of digital certificates
• BValidity of the authorization rules
• CProof of authenticity of the message
• DProof of integrity of the message

• A
  4% (2)
• B
  10% (5)
• C
  8% (4)
• D
  78% (40)

Explanation

The service of non-repudiation from a cryptographic perspective includes the proof of integrity of the message. This means that non-repudiation is a service that ensures that the sender of a message cannot deny sending it, and the receiver of a message cannot deny receiving it, by providing evidence that the message has not been altered or tampered with during transmission. Non- repudiation can be achieved by using digital signatures and certificates, which are cryptographic techniques that bind the identity of the sender to the content of the message, and verify that the message has not been modified. Non-repudiation does not include the validity of digital certificates, as this is a service that ensures that the certificates are authentic, current, and trustworthy, by checking their expiration dates, revocation status, and issuing authorities. Non- repudiation does not include the validity of the authorization rules, as this is a service that ensures that the access to a resource is granted or denied based on the policies and permissions defined by the owner or administrator. Non-repudiation does not include the proof of authenticity of the message, as this is a service that ensures that the message comes from the claimed sender, by verifying their identity and credentials.

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