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The Relying Party Security Technology for Internet Routing (RPSTIR, pronounced "r-p-stir") is a reference implementation of RPKI relying parties. As an open source project, RPSTIR was developed initially by the RPKI team at BBN Technologies. ZDNS has now assumed responsibility for maintenance and evolution of RPSTIR. Dr. Stephen Kent (Emeritus Chief Scientist at BBN) acts as an advisor to ZDNS for this effort.

RPSTIR 2, implemented by GO language, is the new version of RPSTIR developed by RPKI team at ZDNS. RPSTIR 2 is intended to facilitate new function extension and inter-team collaboration and deployment, with RPSTIR architecture unchanged.

RPSTIR 2 supports both rsync and RRDP (IETF RFC 8182) to do repository synchronization and supports SLURM (IETF RFC 8416) to establish local view of the RPKI.