Integrity
Integrity in terms of security can take many forms. For example, when two people exchange data across an insecure medium, how can they be sure of the following facts?
They are indeed speaking to whom they believe they are.
The data they are exchanging has not been modified in transit.
IPSec uses cryptographic functions to ensure that only those authorized to do so can access or modify information.
IPSec performs three main integrity checks:
Authentication of endpoint
Data integrity
Digital signatures
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