Here is something that most businesses do not think about until it is too late. Every IoT device you connect to your network, whether it is a GPS tracker in a vehicle, a vibration sensor on a machine, or an energy meter on the shop floor, is a potential door for someone to walk through uninvited.
IoT security is not a topic that gets people excited. It is not as flashy as AI dashboards or predictive maintenance. But if you get it wrong, nothing else matters. A single compromised device can give an attacker access to your entire factory network, your fleet data, your customer information, and your operations.
The good news is that securing your IoT deployment does not have to be complicated or expensive. You just need to get a few things right from the start. Let us talk about what those things are.
Why IoT Devices Are Easy Targets
Traditional IT security was built for laptops, servers, and phones. These devices have proper operating systems, antivirus software, firewalls, and regular security updates. IoT devices are a different world.
Most IoT sensors and gateways have limited computing power. They cannot run antivirus software. They cannot handle the overhead of heavy encryption on every packet. Many of them run stripped-down operating systems that were built for functionality, not security.
Then there is the scale problem. A factory might have 200 sensors and 10 gateways spread across the shop floor. A fleet might have 500 telematics devices installed in vehicles across the country. Each one is a potential entry point. And unlike a laptop that gets refreshed every 3 years, IoT devices often stay in the field for 5 to 10 years. That is a long time for security vulnerabilities to accumulate.
The third problem is visibility. In many organizations, IoT devices get deployed by operations teams, not IT teams. The IT department may not even know how many devices are on the network, what they are doing, or who has access to them. You cannot secure what you cannot see.
The Real Security Risks in Industrial IoT and Fleet Deployments
Let us get specific about the risks that actually matter for businesses running factories and fleets in India.
Default Credentials That Nobody Changes
This is embarrassingly common. IoT devices ship with default usernames and passwords. "admin/admin" or "root/123456." The installation team gets the device working and moves on to the next one. The default password stays.
An attacker scanning your network finds these devices in minutes. The Mirai botnet attack showed how devastating this can be. Thousands of IoT devices with default credentials were hijacked and used to launch massive attacks that took down major internet services. Your factory sensors could become part of the next botnet without you ever knowing.
Unencrypted Data in Transit
If your devices are sending data to the cloud over plain MQTT or HTTP without TLS encryption, anyone who can sniff your network traffic can read everything. Sensor readings, GPS coordinates, CAN bus data, commands sent to devices. All of it.
For a fleet operator, this means someone could track every vehicle in your fleet. For a manufacturer, this means a competitor could see your production data, energy consumption, and machine utilization. This is not theoretical. It happens.
No Network Segmentation
This is the one that causes the most damage when things go wrong. If your IoT devices sit on the same network as your ERP system, your email server, and your financial databases, then a compromised sensor becomes a gateway to everything.
An attacker gets into one vibration sensor through a firmware vulnerability. From that sensor, they can see the rest of the network. They move laterally to a server with customer data or financial records. The sensor was never the target. It was just the door.
Firmware That Never Gets Updated
IoT device manufacturers release firmware updates that patch security vulnerabilities. But if you have no way to push these updates remotely, they never get installed. The devices stay on the same firmware they shipped with, sometimes for years.
Every known vulnerability in that firmware version is a known way in for an attacker. And vulnerability databases are public. Anyone can look up what is broken in a specific firmware version.
What Secure IoT Actually Looks Like
Now let us talk about what to do about all of this. A secure IoT deployment is built on five layers, and none of them are optional.
Layer 1: Device Identity and Authentication
Every device on your network needs to prove who it is before it can send or receive data. No exceptions.
The best approach is certificate-based authentication. Each device gets a unique X.509 certificate during provisioning. When it connects to the cloud platform, it presents this certificate. The platform verifies it. If the certificate is not valid, the connection is rejected. No username and password to guess. No default credentials to forget.
Both AWS IoT Core and Azure IoT Hub support certificate-based device authentication out of the box. This is not extra cost or extra complexity. It is a configuration choice you make during setup.
Layer 2: Encrypted Communication Everywhere
Every byte of data between your devices and the cloud should be encrypted with TLS. This is non-negotiable.
MQTT over TLS (port 8883) is the standard for IoT device communication. The overhead of TLS on modern IoT hardware is minimal. Even low-cost ESP32 microcontrollers can handle TLS without breaking a sweat. There is no excuse for running unencrypted MQTT in 2026.
For edge gateways communicating with local sensors over protocols like Modbus or OPC UA, the local network should be isolated and the gateway should encrypt everything before sending it to the cloud.
Layer 3: Network Segmentation
Your IoT devices should never be on the same network as your business systems. Full stop.
Create a separate VLAN or subnet for IoT devices. The only traffic allowed out of this network should be MQTT to your cloud broker and firmware update downloads. No access to the internet at large. No access to your corporate network. No access to your ERP or email server.
If you are using edge gateways, they should sit in a DMZ between the IoT network and the cloud. The gateway can talk to IoT devices on one side and the cloud on the other, but the two networks never touch directly.
For fleet telematics, the devices communicate over cellular, which naturally segments them from your office network. But make sure your cloud environment has proper access controls so that a compromised telematics device cannot reach beyond its designated data pipeline.
Layer 4: OTA Updates and Device Management
You need to be able to update every device remotely. If you cannot push a firmware update to a sensor on a factory ceiling or a tracker in a truck in Rajasthan, you have a ticking time bomb.
Over-the-air (OTA) update capability should be part of your IoT architecture from day one. Cloud platforms like AWS IoT Device Management and Azure IoT Hub provide OTA update mechanisms. Your edge gateways should support remote configuration changes and firmware updates.
Build a process around this. When a security patch is released for your device firmware, you should be able to roll it out to all devices within days, not months. Test it on a small batch first, then roll it out fleet-wide.
Layer 5: Continuous Monitoring and Anomaly Detection
Security is not a one-time setup. You need to continuously monitor what your devices are doing and detect when something looks wrong.
What does "wrong" look like? A sensor that normally sends one reading per minute suddenly starts sending 100 per second. A device that only talks to your MQTT broker suddenly tries to connect to an unknown IP address. A gateway that normally transfers 10 MB per day suddenly uploads 2 GB.
These patterns indicate compromise. Your monitoring system should detect them automatically and trigger alerts. Advanced setups use AI-based anomaly detection to learn normal device behaviour and flag deviations. Simpler setups use rule-based alerts on traffic volume, connection patterns, and data rates.
Either way, you need visibility. You need to know what devices are on your network, what they are doing, and when they start doing something they should not.
Industry-Specific Security Considerations
Different industries have different security requirements beyond the basics.
For EV fleet operators, vehicle telematics data includes real-time location, driver behaviour, and battery health. This is sensitive operational data. Additionally, if your system supports remote vehicle immobilization, the command channel must be secured with the highest level of authentication. An attacker who can send immobilization commands to your fleet could cause accidents or hold your operations hostage.
For manufacturers, the risk is operational disruption and intellectual property theft. Production data, OEE metrics, and energy patterns reveal competitive information. If your IoT system can send commands to machines (adjusting parameters, starting and stopping equipment), those command channels need the same security as your most sensitive systems.
For logistics operators, cargo tracking data has direct financial value. Cold chain temperature logs have regulatory implications. A compromised system that alters temperature records could mask a compliance violation.
Zero Trust for IoT: The Right Mindset
The zero trust approach is simple to explain and powerful to implement. Never trust any device, user, or connection by default. Always verify.
In practice, this means every device authenticates on every connection. Every request is authorized against a policy. No device gets blanket access to anything. Access is granted on a per-resource, per-action basis.
For IoT, zero trust means a temperature sensor can publish data to its designated MQTT topic and nothing else. It cannot subscribe to other topics. It cannot access other services. It cannot reach other devices. If that sensor is compromised, the blast radius is limited to that one sensor and its one data stream.
This is how AWS IoT Core policies and Azure IoT Hub device twins work. You define exactly what each device can do, and the platform enforces it. Use this. It is built in. It costs nothing extra.
Common Mistakes We See
After deploying IoT systems across factories and fleets, here are the security mistakes we see most often:
Using the same credentials for all devices. If one is compromised, all are compromised. Every device should have a unique identity.
Skipping TLS because "it is an internal network." Internal networks get breached too. Encrypt everything.
No inventory of deployed devices. Teams lose track of what is installed where. When a vulnerability is announced, they do not know how many devices are affected.
No plan for decommissioning. When a device is removed from service, its certificates should be revoked and its cloud identity deleted. Otherwise, someone who gets hold of the old device has valid credentials to your system.
Treating security as a phase instead of a layer. Security is not something you add after the system works. It is built into every layer from the start.
How Akran IQ Builds Secure IoT Systems
At Akran IQ, security is not an add-on. It is part of every deployment from day one.
Every device we deploy gets a unique certificate-based identity. All communication is encrypted with TLS. Network segmentation is part of our standard architecture. OTA update capability is built into every edge gateway and telematics device.
We use AWS IoT Core and Azure IoT Hub with zero trust policies. Each device can only publish to its designated topics and respond to its designated commands. We monitor device behaviour continuously and alert on anomalies.
For factory deployments, we isolate IoT traffic from the corporate network and place edge gateways in a secure DMZ. For fleet deployments, we secure the command channel with certificate pinning and QoS 2 delivery for critical commands.
And we manage it all ongoing. When a firmware update is needed, we test it and roll it out. When a new vulnerability is disclosed, we assess exposure and patch. You do not need a security team for your IoT. That is part of what we do.
If you are planning an IoT deployment or worried about the security of an existing one, get in touch. We will assess your setup and show you exactly where the gaps are and how to close them.