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NEMA EVSE 1.2

2015 Edition, 2015

Complete Document

EV Charging Network Interoperability Standards Part 2: A Contactless RFID Credential for Authentication (UR Interface)



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Description / Abstract:

This standard describes a protocol for authenticating EV charging service requests using ISO/IEC 14443 contactless proximity Radio Frequency Identification (RFID)–type credentials. Authentication provides assurance to the Electric Vehicle (EV) charging network that the EV driver is the correct authorized party incurring a financial or other obligation for the services to be rendered. Similarly, the EV driver can have confidence that transactions have not been authenticated using forged or fraudulent credentials. Authentication is also an important prerequisite in making access control decisions when other policy considerations need to be applied. The protocol specified in this standard enables secure and trustable EV charging service transactions to take place for both the service provider and the service consumer

The method of EV driver authentication involves the use of an ISO/IEC 7816-4/5/8–based challengeresponse application layer protocol and ISO/IEC 14443 contactless communication. EV drivers (also referred to as users) can hold the contactless authentication credentials in proximity to EV charging stations to authenticate, authorize, and receive EV charging services. The authentication credentials can be implemented in wallet-sized cards, mobile phones, key-fob tokens, or other physical form factors. Contactless authentication devices compliant with this standard on EV charging stations interact with authentication credentials to obtain unique and verifiable challenge-response data ascribing to the authenticity of the credentials. The challenge-response data are then sent to and validated by the credential authenticators in an online manner to confirm that the authentication credentials have not been impersonated (or otherwise compromised) and that the authentication credentials are in good standing (i.e., not declared lost or the associated account overdrawn).

The authentication credential and protocol defined by this standard applies to intra-network operation, as well as operation across inter-networked, multi-operator EV charging networks—with the principal difference in the latter case that authentication takes place at the foreign EV charging network responsible for issuing the credential, rather than at the local network. It is expected that participating networks will issue credentials compliant with this standard to enable their users to receive on-network and off-network EV charging services. By defining an industry standard authentication credential, service interoperability and roaming is made possible enabling EV drivers to receive charging and other services among compatible equipment and participating networks.

In subsequent sections of this standard, the data objects and messages exchanged between the authentication credential, the authentication device, and the credential authenticator are described. These sections give the syntax and semantics of the data objects, along with the sequence of command and response message exchanges using ISO/IEC 7816-4/5/8 Application Protocol Data Units (APDUs). The challenge-response protocol is described, and a method of authentication data validation with the credential authenticator is also given.
ANSI/NEMA MW 1000, 2014