Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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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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