Minimal IP Encapsulating Security Payload (ESP), January 2023
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This document describes the minimal properties that an IP Encapsulating Security Payload (ESP) implementation needs to meet to remain interoperable with the standard ESP as defined in RFC 4303. Such a minimal version of ESP is not intended to become a replacement of ESP in RFC 4303. Instead, a minimal implementation is expected to be optimized for constrained environments while remaining interoperable with implementations of ESP. In addition, this document provides some considerations for implementing minimal ESP in a constrained environment, such as limiting the number of flash writes, handling frequent wakeup and sleep states, limiting wakeup time, and reducing the use of random generation.
This document does not update or modify RFC 4303. It provides a compact description of how to implement the minimal version of that protocol. RFC 4303 remains the authoritative description.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.