GEGN8603 Iss 1

This document provides guidance on GERT8403 ERTMS Key Management, which mandates requirements for the management of cryptographic keys on the mainline railway to facilitate secure ERTMS data radio communication. ERTMS exchanges information between trackside equipment and trains and vice versa in the form of data messages. When radio is used for these data messages a secure connection is required, and corresponding keys must be available on either side of the connection.

A review of the requirements in GERT8403 identified that they are not eligible to be National Safety Rules and are therefore out of scope of RGSs. As requirements that facilitate the operation of the ERTMS key management provide benefits to the industry, a new RIS-0743-CCS has been developed based on GERT8403 and its associated guidance GEGN8603, and the latest ERTMS knowledge and requirements.