IPSec Protocol Framework
This section explains how encryption, integrity, and authentication are applied to the IPSec protocol suite.
IPSec Protocols
IPSec is a framework of open standards. IPSec spells out the messaging to secure the communications but relies on existing algorithms, such as DES and 3DES, to implement the encryption and authentication. The two main IPSec framework protocols are as follows:
Authentication Header (AH)— AH is the appropriate protocol when confidentiality is not required or permitted. It provides data authentication and integrity for IP packets that are passed between two systems. It is a means of verifying that any message that is passed from router A to router B has not been modified during transit. It verifies ...
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