RIPE NCC's Implementation of Resource Public Key Infrastructure (RPKI) Certificate Tree Validation

This document describes the approach to validate the content of the RPKI certificate tree, as it is implemented in the RIPE NCC RPKI Validator. This approach is independent of a particular object retrieval mechanism. This allows it to be used with repositories available over the rsync protocol, the RPKI Repository Delta Protocol, and repositories that use a mix of both.