HMACs are said to provide protection primarily for which property?

Prepare for the Network Security (NETSEC) 3 Test with flashcards and multiple choice questions. Each question offers hints and explanations. Get exam-ready efficiently!

Multiple Choice

HMACs are said to provide protection primarily for which property?

Explanation:
HMACs provide data integrity and origin authentication for a message by using a secret key with a cryptographic hash. This means the recipient can verify that the message hasn’t been altered in transit and that it was created by someone who knows the shared secret. It does not provide confidentiality, since the payload isn’t encrypted and can be read by anyone who can view the transmission. It also does not offer nonrepudiation, because with a shared secret, either party could have produced the MAC, so you can’t definitively prove who sent it. Availability is not addressed by HMACs, which focus on authentication and integrity rather than uptime or service resilience.

HMACs provide data integrity and origin authentication for a message by using a secret key with a cryptographic hash. This means the recipient can verify that the message hasn’t been altered in transit and that it was created by someone who knows the shared secret. It does not provide confidentiality, since the payload isn’t encrypted and can be read by anyone who can view the transmission. It also does not offer nonrepudiation, because with a shared secret, either party could have produced the MAC, so you can’t definitively prove who sent it. Availability is not addressed by HMACs, which focus on authentication and integrity rather than uptime or service resilience.

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