AIS-156-2020 BMS Cybersecurity Testing Gets India Mandate

India Adds BMS Wireless Security Testing Under AIS-156-2020

On August 18, the Government of India amended AIS-156-2020 BMS cybersecurity requirements for L-category electric vehicles equipped with Bluetooth Classic, Bluetooth Low Energy, or other wireless interfaces. The amendment adds a security-testing clause for battery management systems connected to rechargeable electrical energy storage systems (REESS). The change applies to BMS functions that can affect vehicle or battery safety and establishes specific verification requirements for testing agencies. It focuses on preventing unauthorized wireless access to the BMS while retaining the technical and safety functions required for vehicle type approval in India.

Unauthorized BMS Access Faces Mandatory Verification

Under the amended requirements, testing agencies must verify that unauthorized devices and applications cannot discover, connect to, or control the BMS without valid authentication and authorization. The protected functions include contactor and relay control, charge and discharge enable or disable operations, cell-balancing control, fault reset, and changes to protection thresholds. The rules also address wireless telemetry access, firmware updates, and configuration changes. These provisions require security controls to be assessed in relation to functions that could influence battery operation or safety in L-category electric vehicles sold or approved in India.

Cybersecurity Tests Cover Multiple Wireless Attack Methods

The prescribed cybersecurity testing covers several attack and resilience scenarios. Testing agencies must assess Bluetooth discoverability, pairing and authentication, unauthorized command injection, replay attacks, spoofing, and man-in-the-middle attacks. The requirements also include denial-of-service, or “bluesmacking,” attacks, along with protocol and firmware fuzzing. Testing must use the exact BMS hardware and firmware intended for vehicle type approval rather than a separate security-test configuration. Where applicable, the battery must also be evaluated in both stationary and simulated moving conditions so that wireless security behavior is assessed under the required operating circumstances in India.

Safety-Critical Commands Must Resist Unauthorized Control

The amendment sets specific expectations for how the BMS should respond to attempted wireless compromise. Safety-relevant commands from unauthorized applications must be rejected, while replayed commands must be prevented through mechanisms such as session keys, nonces, or counters. The BMS must also resist impersonation by rogue devices and maintain core protection functions when exposed to abnormal Bluetooth traffic or malformed data requests. For the regulated L-category electric-vehicle market, these requirements connect cybersecurity testing directly with the validation of safety-critical battery controls and the hardware and firmware configuration submitted for type approval.

Specified Equipment Supports BMS Security Validation

The required test setup includes Bluetooth-enabled computers and smartphones, protocol analyzers, generic GATT or Bluetooth terminal applications, vehicle or bench test rigs, and data-logging equipment. This equipment is intended to provide testing agencies with the means to examine wireless interfaces, send and observe protocol traffic, evaluate command handling, and record system behavior during security tests. By specifying both the test environment and the BMS configuration, the amended AIS-156-2020 framework establishes a practical basis for checking whether wireless connectivity can expose safety-relevant battery functions to unauthorized devices or applications.

Industry Impact & Outlook

The amendment raises the cybersecurity validation burden for manufacturers and testing agencies seeking type approval for affected L-category electric vehicles, particularly where BMS connectivity includes Bluetooth or other wireless interfaces. By requiring assessment of both common wireless attack techniques and safety-critical command handling, the framework makes secure authentication, command protection, firmware integrity, and resilience to abnormal traffic part of the approval-focused testing process. Manufacturers may therefore need to ensure that production-intended BMS hardware and firmware can satisfy these checks before approval. The change also gives testing agencies a defined equipment and test-condition framework for evaluating wireless BMS security.

Frequently Asked Questions

What does the AIS-156-2020 amendment require for wireless BMS security?
The amendment requires testing agencies to verify that unauthorized devices and applications cannot discover, connect to, or control wireless BMS functions without valid authentication and authorization. Testing covers Bluetooth discoverability, pairing, command injection, replay, spoofing, man-in-the-middle attacks, denial-of-service or “bluesmacking” attacks, and protocol and firmware fuzzing. The exact BMS hardware and firmware intended for vehicle type approval must be tested, with stationary and simulated moving conditions used where applicable. Safety-critical commands must be rejected when unauthorized, while core protection functions must continue during abnormal wireless traffic.