IoT security best practices: 7 ways to protect your devices

The rapid growth of the Internet of Things (IoT) has revolutionized industries, enabling enterprises to streamline operations, improve efficiencies, and create innovative services. However, with the growing number of connected devices comes an increased risk of cyber threats. Ensuring robust security for IoT ecosystems is a necessity. In this post, we’ll explore the top IoT security challenges and provide actionable best practices to safeguard your connected devices and the data they generate.

Secure devices at the hardware level

Secure IoT devices at the hardware level by implementing tamper-resistant components, secure boot processes, and hardware-based encryption modules. Trusted Platform Modules (TPMs) or Hardware Security Modules (HSMs) ensure only authenticated firmware runs on each device. Embed unique cryptographic keys within the hardware to protect device identity.

Key actions

• Implement tamper-resistant hardware.
• Use hardware-based cryptography for device identity and data encryption.
• Ensure devices are equipped with secure boot capabilities.

Encrypt data across all layers

Encrypt IoT data across all layers (on the device, during transmission, and at rest) using secure communication protocols like TLS or DTLS. A shared security model divides responsibility between customers and connectivity providers:

• Customer responsibility: Encrypting data sent over cellular networks and securing devices, servers, and end-customer data.
• Connectivity provider responsibility: Securing their environments and protecting data routed between customer devices and destinations.

Learn more about data protection best practices for cellular IoT networks.

Key actions

• Use strong encryption algorithms for data transmission (e.g., AES-256).
• Ensure data is encrypted on the device, during transmission, and when stored.
• Regularly update encryption protocols to counter new vulnerabilities.

Implement strong authentication and access control

Prevent unauthorized access by implementing multi-factor authentication (MFA) and role-based access control (RBAC). MFA ensures only authorized users and devices connect to your network, while RBAC limits permissions to minimize attack surfaces during a breach.

Strong authentication is critical across industries:

• Point-of-sale systems handling payment data
• Asset trackers transmitting location information
• Internet of Healthcare Things (IoHT) devices transmitting sensitive medical data

Key actions

• Enforce multi-factor authentication for device access.
• Use unique, strong passwords and change default credentials immediately upon installation.
• Implement role-based access control (RBAC) to limit permissions.

Regularly update firmware and software

Keeping IoT devices and systems up to date is crucial to maintaining security. Cyber attackers frequently exploit vulnerabilities in outdated firmware or software. Ensuring that all devices have the latest security patches and updates will significantly reduce the risk of compromise. Automating firmware updates and monitoring patch compliance across your IoT ecosystem can simplify this process.

Key actions

• Enable automatic firmware and software updates.
• Ensure devices are compliant with the latest security patches.
• Monitor for firmware vulnerabilities and act quickly to patch them.

Secure the network layer

Secure the network layer by segmenting IoT traffic from other IT networks and deploying firewalls, VPNs, and intrusion detection/prevention systems (IDS/IPS). Close backdoors, secure open ports, and enforce strict password policies to block both internal and external threats.

Key actions

• Use connectivity providers that utilize private APNs for secure device communication.
• Implement network segmentation to separate IoT traffic from other data flows.
• Deploy firewalls, IDS, and IPS to monitor and protect IoT networks.

Monitor and respond to security threats

A proactive approach to IoT security requires continuous monitoring for anomalies and potential threats across your devices and networks. Security Information and Event Management (SIEM) tools can help track IoT device behavior, detect abnormal activity, and send alerts in real time. Given those benefits, it's not surprising to hear that the SIEM market is growing at a CAGR of 16.8% through 2033. Additionally, establishing a clear incident response plan ensures you can quickly mitigate any threats that arise.

Effective monitoring starts with understanding what abnormal behavior looks like in your specific deployment. Establish baseline patterns for your use case, then watch for these common threat indicators:

• Unexpected data usage spikes: Deviations from established consumption baselines
• Prolonged SIM inactivity: Silence when devices should be communicating
• Unauthorized location changes: Movement that doesn't match expected patterns
• Unrecognized connection attempts: Access from unknown networks or regions

Define specific parameters that trigger alerts when exceeded. The goal: catch genuine threats while minimizing false positives that overwhelm your security team.

Critical thresholds to monitor:

• Data usage limits: Flag potential breaches or device malfunctions
• Connection frequency changes: Indicate possible device tampering
• Geographic boundaries: Trigger location-based alerts
• Session duration anomalies: Detect unusual connection patterns

Deliver notifications through multiple channels to ensure critical issues reach the right people immediately. Options include email alerts for non-urgent issues, SMS notifications for critical security events, dashboard notifications for real-time monitoring teams, and API webhooks for automated response systems. Response time requirements vary by use case. Life-critical applications may need alerts within seconds, while asset tracking might allow for minutes. Consider implementing escalation procedures that route unacknowledged alerts to backup contacts.

The most effective IoT security strategies combine real-time alerts with historical reporting:

• Real-time monitoring: Catches active threats as they happen for immediate response
• Historical reporting: Identifies patterns, supports forensic analysis, and demonstrates regulatory compliance

Secure the entire IoT solution lifecycle

The most effective IoT security strategies combine real-time alerts with historical reporting:

• Real-time monitoring: Catches active threats as they happen for immediate response
• Historical reporting: Identifies patterns, supports forensic analysis, and demonstrates regulatory compliance

Key actions

• Design IoT devices with security in mind from the outset.
• Conduct regular security audits throughout the lifecycle.
• Ensure secure decommissioning of IoT devices with proper data erasure.

As IoT continues to drive digital transformation across industries, prioritizing security will be critical to ensuring the integrity and success of connected solutions. By implementing these best practices, you can build a robust security foundation that protects your devices, data, and business operations.

Hologram delivers cellular IoT security

We know that IoT security is a multifaceted challenge that requires a proactive and layered approach. We've woven security into all facets of our Cellular SIMs. Plus, our Cellular IoT experts are here to help you customize a security program to meet your unique security needs.

• Data: In our shared security model, customers are responsible for encrypting data sent over the cellular network and securing devices, servers, and end-customer data. Hologram secures our environments and the security of data routed between customer devices and its destination.
• Access control: Customers can add Multi-Factor Authentication (MFA) to their Hologram Dashboard account to reduce the risk of unauthorized access.
• Firmware: SIM cards provide robust cellular connectivity and are future-proofed by Hologram's use of GSMA and SGP standards to support and deploy eUICC technology.
• Network security: Hologram’s SDN provides secure bi-directional communications that offer many of the benefits of VPN, without the significant cost overhead.
• Monitoring: Hologram provides a detailed dashboard and filterable reports, allowing clients to look at information from fleet scale, down to individual devices, as well as APIs for integration with internal systems.

Frequently asked questions

What is the biggest security risk for IoT devices?

Weak authentication and outdated firmware are the most common vulnerabilities, allowing attackers to exploit default passwords or unpatched software to gain unauthorized access to devices and networks.

How do I secure my IoT devices at home?

Change default passwords immediately, enable automatic firmware updates, use a separate network for IoT devices, and implement multi-factor authentication wherever possible.

What encryption should I use for IoT data?

Use AES-256 encryption for data at rest and TLS or DTLS protocols for data in transit to protect information from interception during transmission.

How often should IoT firmware be updated?

Enable automatic updates to apply security patches as soon as they become available, and manually check for updates at least monthly for devices without automatic update capabilities.

What is a shared security model in IoT?

A shared security model divides responsibility between customers (who secure devices and encrypt data) and connectivity providers (who secure network infrastructure and data routing).

Can IoT devices be hacked through the network?

Yes, unsecured networks with open ports, weak passwords, or no segmentation allow attackers to access IoT devices and potentially compromise entire systems.

What is role-based access control for IoT?

RBAC limits what each user or device can access and do within your IoT network, minimizing damage if credentials are compromised during a security breach.

How do I monitor IoT devices for security threats?

Use SIEM tools to track device behavior, set alerts for data usage spikes, connection anomalies, and unauthorized location changes, then establish escalation procedures for unacknowledged alerts.