This part of EN ISO 24534 provides the requirements for an Electronic Registration Identification (ERI) that is based on an identifier assigned to a vehicle (e.g. for recognition by national authorities) suitable to be used for: – electronic identification of local and foreign vehicles by national authorities, – vehicle manufacturing, in-life-maintenance and end-of-life identification (vehicle life cycle management), – adaptation of vehicle data, e.g. in case of international re-sales, – safety-related purposes, – crime reduction, and – commercial services. It adheres to privacy and data protection regulations. This part of EN ISO 24534 specifies the interfaces for a secure exchange of data between an ERT and an ERI reader or ERI writer in or outside the vehicle using asymmetric encryption techniques. NOTE 1 – The onboard device containing the ERI data is called the Electronic Registration Tag (ERT). This Technical Specification includes: – the application layer interface between an ERT and an onboard ERI reader or writer, – the application layer interface between the onboard ERI equipment and external ERI readers and writers, and – security issues related to the communication with the ERT. NOTE 2 – The vehicle identifiers and possible additional vehicle data (as typically contained in vehicle registration certificates) are defined in EN ISO 24534-3. NOTE 3 – The secure application layer interfaces for the exchange of ERI data with an ERI reader or writer are specified in EN ISO 24534-4 and ISO 24534-5.