Encapsulating security payloads

- The Encapsulating Security Payload protocol…provides confidentiality, authentication,…integrity, and anti-replay service for IP version 4…and IP version 6.…What services are selected are determined…by the Security Association, and where on the network…it is implemented.…This provides the attributes which are necessary…for the Encapsulating Security Payload process.…

You can use the encryption-only feature to provide…for confidentiality with the Encapsulating Security Payload.…However, using encryption without integrity,…may leave the communication stream…vulnerable to attacks.…Here we see a top-level format…of an Encapsulating Security Payload packet.…Let's take a look at the field values.…The Security Parameter Index is added to the header…that distinguishes between traffic streams…that use different encryption rules and algorithms.…

The Sequence Number is a mandatory 32-bit field…containing an incrementing counter value.…Extended, 64-bit Sequence Number should be implemented,…as it is an extension to the current 32-bit…