September 2022
Intermediate to advanced
544 pages
18h 10m
English
book
Network Security: Private Communications in a Public World, 3rd Edition
by Charlie Kaufman, Radia Perlman, Mike Speciner, Ray Perlner
Content preview from Network Security: Private Communications in a Public World, 3rd Edition
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10 Trusted Intermediaries
10.1 Introduction
If nodes Alice and Bob want to be able to communicate securely, they need to know keys for each other. Configuring each node with keys for every other node will not scale beyond a small number, so a trusted third party (someone that Alice and Bob trust) is used for introducing Alice and Bob to each other.
In this chapter we describe different types of systems based on trusted third parties. One is a system that uses only secret keys, in which case the trusted third party is usually known as a KDC (Key Distribution Center). In a public key system, the trusted third party is usually known as a certification authority (CA), and it signs certificates, which assert things such as the mapping between the ...
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