ISO 24534-4:2010

Overview

ISO 24534-4:2010 - "Automatic vehicle and equipment identification - Electronic registration identification (ERI) for vehicles - Part 4: Secure communications using asymmetrical techniques" specifies secure, application‑layer interfaces for exchanging electronic registration identification between an onboard Electronic Registration Tag (ERT) and ERI readers/writers inside or outside the vehicle. The standard focuses on asymmetric cryptography to provide authentication, confidentiality and integrity while aligning with privacy and data‑protection requirements.

Key topics and technical requirements

• Scope of ERI: Supports unique vehicle identifiers plus optional additional vehicle data for registration, lifecycle management, resale, safety, crime reduction and commercial services.
• Security model: Uses asymmetrical techniques (public/private key mechanisms) to enable digital signatures, entity authentication and access control; supports public‑key certificates and certification authorities.
• Interfaces specified:
  • Application layer between an ERT and onboard ERI reader/writer.
  • Application layer between onboard ERI equipment and external ERI readers/writers.
  • Security-related interfaces and transaction definitions (including challenge/response and signed data exchanges).
• Interoperability and device capability levels: Designed to work with a range of ERT complexity - from simple read‑only tags to secure modules (SAMs) supporting advanced authentication and historic data.
• Encoding and protocol artifacts: ASN.1 modules and encoding rules are provided (normative references include ISO/IEC 8824 and PER encoding), plus normative annexes and operational scenarios to guide implementations.
• Privacy and authorization: Mechanisms for selective disclosure, access control lists, and authorization of third parties (e.g., registration authorities, service providers) while adhering to national and international privacy rules.

Practical applications and users

Who benefits from implementing ISO 24534-4:

• National and regional vehicle registration authorities - trusted electronic vehicle ID for enforcement, cross‑border recognition and lifecycle events.
• Vehicle manufacturers and OEMs - embedding ERTs for manufacturing, in‑life maintenance and end‑of‑life tracking.
• Tolling, parking and commercial service providers - secure identification and roaming services.
• Law enforcement and safety agencies - verified vehicle identity for crime reduction and safety checks.
• ITS integrators and hardware vendors - designing readers, ERT modules and secure application software that implement the specified application layer and asymmetric security services.

Practical benefits include interoperable vehicle identification, support for international resale and transfer, improved anti‑fraud controls, and privacy‑aware secure communication between vehicle and infrastructure.

Related standards

• ISO 24534‑1/2/3/5 (ERI architecture, operational requirements, vehicle data, symmetric techniques)
• ISO 14814 / ISO 14816 (AVI provisions referenced)
• ISO/IEC 8824, 8825‑2 (ASN.1 and PER encoding)
• ISO 14443 (contactless IC cards) and ISO 15628 (DSRC application layer)

Keywords: ISO 24534-4:2010, ERI, Electronic Registration Identification, ERT, asymmetric encryption, secure communications, vehicle identification, ASN.1, DSRC, privacy, vehicle lifecycle.