Reference design; authenticated data chains in the Industrial IoT

August 30, 2016 // By Graham Prophet
Maxim Integrated has applied a highly secure coprocessor to support Arduino-compatible and ARM mbed platforms, simplifying prototyping: the reference design comprises a protected sensor node with a DS28E15 secure authenticator, DS7505 temperature sensor, and MAX44009 light sensor, all connected to the ARM mbed technology shield with its DS2465 secure coprocessor.

Addressing many issues related to system security in Industrial Internet of Things (IIoT) installations, the MAXREFDES143# embedded security reference design from Maxim Integrated Products is designed to provide protection against counterfeit sensor data, guaranteeing its authenticity and integrity along the entire data chain, from transducer to the cloud.


The rapid growth of IoT capabilities for industrial applications comes, Maxim says, with legitimate concerns about data integrity, due to deliberate corruption of critical sensor data anywhere between a source and the cloud. The reference design’s architecture and components, Arduino-compatible hardware interface, and ARM mbed libraries support simplifies development of secure, uncorrupted, and authenticated sensor-to-web data. It is suitable for analogue sensor node and data authentication in factory automation and industrial processing applications.

The reference design’s two-stage hierarchical architecture consists of a shield that communicates to a web server, and a protected sensor node for data acquisition and authentication. The shield includes a Wi-Fi module; a DS2465 secure coprocessor for offloading SHA-256 cryptographic computation; 1-Wire and I²C interfaces; user-interface LCD, LEDs, and pushbuttons; along with alarm and logging functions. The design provides hardware and source code to implement an authenticated node solution and web server interface; a free evaluation web server provides an immediate out-of-the box implementation for real-time data collection and storage of sensor data; and security is assured as the SHA-256 coprocessor offloads data authentication task, securely stores node authentication keys, where each node has a unique key.


The MAXREFDES143# IoT embedded security reference design is available for $75 at Maxim's website and select franchised distributors.Ddesign files for hardware and firmware are free and available online.


Maxim Integrated;