Nonce: A number that the protocol can use only once is known as “nonce”. Features of nonce: It is a type of data bit identification in IT security and other types of technical systems and can be characterized as a "throwaway" bit of data that is a placeholder for specific security strategies. In SSL, nonce are used to defend against the “connection replay attack” and also used to protect that entity against attacks which fall under the very large umbrella of "replay". Once-in-a-lifetime value of nonce is because the entity sending the nonce will never again use that value to check whether another entity is "live" till the entities lifetime. HMAC: A mechanism for calculating a message authentication code involving a hash function in combination with a secret key is called Hash-based message authentication code (HMAC).

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Chapter 8, Problem R18RQ

Program Plan Intro

Nonce:

A number that the protocol can use only once is known as “nonce”.

Features of nonce:

It is a type of data bit identification in IT security and other types of technical systems and can be characterized as a "throwaway" bit of data that is a placeholder for specific security strategies.

In SSL, nonce are used to defend against the “connection replay attack” and also used to protect that entity against attacks which fall under the very large umbrella of "replay".

Once-in-a-lifetime value of nonce is because the entity sending the nonce will never again use that value to check whether another entity is "live" till the entities lifetime.

HMAC:

A mechanism for calculating a message authentication code involving a hash function in combination with a secret key is called Hash-based message authentication code (HMAC).

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