Reference design for secure data transport in the IoT
The proven architecture of the MAXREFDES143#, an Arduino compatible hardware interface and support for the ARM-mbed function libraries simplify the development of mechanisms and devices that enable the secure, unmanipulated and authenticated data transport from sensor to web. The reference design is thus an ideal solution for analogue sensor nodes and data authentication in factory automation and industrial process applications.
MAXREFDES143# reference design
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 sensor node contains a DS28E15 secure authenticator, DS7505 temperature sensor, and MAX44009 light sensor.
Key advantages include fast time-to-market and ease of use: Free evaluation web server provides an immediate out-of-the box implementation for real-time data collection and storage of sensor data. The most important highlight however is the security: An SHA-256 coprocessor offloads data authentication task. The reference design securely stores node authentication key; each node has a unique key.
The MAXREFDES143# embedded security reference design is available for $75 at Maxim’s website and select franchised distributors. Hardware and firmware design files are free and available online.
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