Chapter 68. What Is IPSEC?
Ipsec is a name that's been given to a suite of security protocols used to secure IP traffic between computers. I'll talk about these individual protocols shortly, but for now let's just talk about the main ideas behind this initiative as a whole. Recall from my discussion of CIA in Item 58 that to secure a channel we want to start with an authenticated key exchange, during which two things happen: The communicating peers develop trust in each other's identity, and they discover a session key that the bad guys won't know. Based on this session key, the peers then provide integrity protection over the channel via MAC protocols (usually HMAC), and the channel is encrypted as well. These countermeasures mitigate lots of ...
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