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How can you ensure Android HMI security?

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Android HMI security is a crucial aspect of control engineering, especially when developing applications for industrial or critical systems. Human-machine interfaces (HMI) are the devices that allow users to interact with machines, such as touchscreens, keyboards, or voice commands. Android is a popular platform for HMI development, as it offers a rich set of features, flexibility, and compatibility. However, Android also poses some security challenges that need to be addressed to ensure the integrity, confidentiality, and availability of the HMI data and functionality. In this article, we will discuss some of the best practices and techniques to ensure Android HMI security.

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1 Use secure communication protocols

One of the first steps to ensure Android HMI security is to use secure communication protocols between the HMI device and the machine or server. Secure communication protocols encrypt the data and authenticate the parties involved, preventing unauthorized access, interception, or modification. Some of the common secure communication protocols for Android HMI are HTTPS, SSL/TLS, MQTT, and OPC UA. These protocols provide different levels of security and performance, depending on the requirements and constraints of the HMI application.

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SOUMITRA DAS

Deputy GM (E&T) @ ONGC | M.TECH,MBA ,MDBA, Advanced Diploma in Mgt.
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1. Proper authentication for use 2. Using latest patch and update for OS 3. Install only the application which is reliable for use

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2 Implement proper authentication and authorization

Another important step to ensure Android HMI security is to implement proper authentication and authorization mechanisms for the HMI users and devices. Authentication verifies the identity of the user or device, while authorization determines the level of access and permissions granted to them. Authentication and authorization can be implemented using various methods, such as passwords, PINs, biometrics, tokens, certificates, or OAuth. These methods prevent unauthorized or malicious users or devices from accessing or manipulating the HMI data or functionality.

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Cesar Avalos

Product Manager | Asesoramiento en equipos VDF, partidores suaves, PLC y HMI en Baja tensión.
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Parte de las autenticaciones que hay que tener en cuenta, es primeramente saber que tan critica es la información que va a manejar, y los permisos que tendrá el usuario. El uso de solo números por ejemplo, es una pésima idea si se manejará información delicada, ya que suelen ser muy vulnerables a ciberataques, teniendo tiempos de descifrado de segundos.

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3 Apply regular updates and patches

A third step to ensure Android HMI security is to apply regular updates and patches to the HMI device and the Android operating system. Updates and patches fix the bugs and vulnerabilities that may compromise the security of the HMI device or the Android OS. They also improve the performance and stability of the HMI application and the Android platform. Updates and patches can be applied manually or automatically, depending on the preferences and policies of the HMI developer or user. However, it is advisable to always backup the HMI data and configuration before applying any updates or patches.

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4 Use code obfuscation and encryption

A fourth step to ensure Android HMI security is to use code obfuscation and encryption techniques for the HMI application code and the Android APK file. Code obfuscation and encryption make the code and the APK file harder to read, reverse engineer, or tamper with. They also protect the intellectual property and the business logic of the HMI application. Code obfuscation and encryption can be done using various tools, such as ProGuard, DexGuard, or APK Encryptor. These tools transform the code and the APK file into a more complex and less comprehensible form.

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5 Follow the principle of least privilege

A fifth step to ensure Android HMI security is to follow the principle of least privilege for the HMI application and the Android device. The principle of least privilege states that the HMI application and the Android device should only have the minimum amount of access and permissions required to perform their functions. This reduces the attack surface and the potential damage that can be caused by a security breach. The principle of least privilege can be followed by using the Android permission system, the Android sandbox, and the Android security features, such as SELinux, encryption, and lock screen.

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6 Test and audit the HMI security

A sixth and final step to ensure Android HMI security is to test and audit the HMI security regularly and comprehensively. Testing and auditing the HMI security can help identify and fix any security issues, gaps, or weaknesses that may exist in the HMI application, the Android device, or the communication network. Testing and auditing the HMI security can be done using various tools, methods, and standards, such as penetration testing, vulnerability scanning, code analysis, security audits, or ISO 27001. These tools, methods, and standards can help evaluate and improve the HMI security posture and compliance.

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Daniel Ourom-Swart

?????Securing Industrial IT/OT Infrastructures ?? Head of OT at Netsecurity | ISA/IEC62443 Expert | GICSP
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Secure coding practices should be followed to ensure that malicious code cannot be used. A good practice is to follow the requirements stated in IEC62443-3-3, specially SR 3.5 Input validation, SR 3.6 Deterministic output and SR 3.7 Error handling should be followed.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How can you ensure Android HMI security?

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3

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1 Use secure communication protocols

2 Implement proper authentication and authorization

3 Apply regular updates and patches

4 Use code obfuscation and encryption

5 Follow the principle of least privilege

6 Test and audit the HMI security

7 Here’s what else to consider

Control Engineering

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