Overview
EN ISO 24534-4:2010/A1:2019 (ISO 24534-4:2010/Amd 1:2019) is an amendment to Part 4 of the ISO 24534 series for Automatic vehicle and equipment identification - Electronic Registration Identification (ERI) for vehicles. This document specifies secure application‑level communications using asymmetrical cryptographic techniques for ERI transactions. It is published by CEN as a harmonized European standard for intelligent transport systems and was approved in March 2019.
Key Topics
- Scope and purpose: Defines message structures and transaction flows to support secure ERI exchanges between roadside equipment, vehicle transponders (ERTs) and back‑end registration authorities.
- Asymmetric security: Focuses on public‑key approaches (signatures, encipherment) for authentication, confidentiality and integrity. Error codes and capability flags for unsupported algorithms are included (e.g., publicKeyEncryptionAlgorithmNotSupported, signingAlgorithmNotSupported).
- ASN.1 protocol modules: Normative ASN.1 modules (ElectronicRegistrationIdentificationTransactionsModule) and informative examples are provided in Annex A to ensure consistent encoding and interoperability of PDUs such as EriPdu, EriRequestPdu, EriResponsePdu, and secured payload types.
- Transaction taxonomy: A comprehensive list of transaction codes (tc-getEriData, tc-setEriData, tc-commissionErt, tc-withdrawCommissioning, tc-getErtCapabilities, etc.) and their argument/result/error types are defined to standardize operations.
- Data models and flags: Definitions for ERI payloads (CleartextEriData, EriDataOrId), ERT security flags and historic data retrieval are included.
- Amendment details: A1 updates specific ASN.1 definitions-revised error enumerations (CommissionErtErrors), changed transaction code for withdrawCommissioning (now 14), updated WithdrawCommissioningResultData structure, and revised EntityRole enumeration.
Applications
- Implementation of secure roadside-to-vehicle ERI services for tolling, enforcement, parking, vehicle registration checks and other ITS services.
- Integration guidance for vehicle manufacturers, registration authorities, system integrators, and ITS equipment vendors to implement interoperable ERI transponders and back‑end services.
- Reference for PKI implementers and security architects designing asymmetric key management, signing and encryption workflows for ERI transactions.
- Useful to software developers who encode/decode ERI messages (ASN.1), test labs and conformity assessment bodies verifying compliance.
Related Standards
- ISO 24534 series (other parts) - vehicle ERI data and interfaces
- ISO/IEC and ITS standards referenced for ASN.1 and DSRC/AVI interfaces (e.g., modules referencing iso17264)
This amendment ensures consistent ASN.1 encodings, clearer error handling and updated role/transaction semantics - essential for secure, interoperable ERI deployments in intelligent transport systems.