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The MAXREFDES155# is an internet-of-things (IoT) embedded-security reference design, built to authenticate and control a sensing node using elliptic-curve-based public-key cryptography with control and notification from a web server.
The hardware includes an ARM® mbed™ shield and attached sensor endpoint. The shield contains a DS2476 DeepCover® ECDSA/SHA-2 coprocessor, Wifi communication, LCD push-button controls, and status LEDs. The sensor endpoint is attached to the shield using a 300mm cable and contains a DS28C36 DeepCover ECDSA/SHA-2 authenticator, IR-thermal sensor, and aiming laser for the IR sensor. The MAXREFDES155# is equipped with a standard Arduino® form-factor shield connector for immediate testing using an mbed board such as the MAX32600MBED#. The combination of these two devices represent an IoT device. Communication to the web server is accomplished with the shield Wifi circuitry. Communication from the shield to the attached sensor module is accomplished over I2C. The sensor module represents an IoT endpoint that generates small data with a requirement for message authenticity/integrity and secure on/off operational control.
The design is hierarchical with each mbed platform and shield communicating data from the sensor node to a web server that maintains a centralized log and dispatches notifications as necessary. The simplicity of this design enables rapid integration into any star-topology IoT network to provide security with the low overhead and cost provided by the ECDSA-P256 asymmetric-key and SHA-256 symmetric-key algorithms.
NOTE: Operating the MAXREFDES155# requires a separate purchase of a MAX32600MBED# mbed platform.
Refer to the Details tab for more information. Design files including; schematic, PCB files and bill of materials (BOM) can be downloaded from the Design Resources tab. As with all Maxim reference designs, boards are available for purchase.
Features
Public-key infrastructure to authenticate nodes and messages
ECDSA-P256 public-key authentication
SHA-256 HMAC secret-key authentication
Securely controls on/off operation of IoT device endpoints
Demonstrates secure download for remote update of an IoT device configuration file
DeepCover secure key storage and protection
Wifi interface for communication to a web server
Competitive Advantages
Crypto-strong authentication
No need for secure-key storage memory on processor
Low-overhead performance for signed data between the web server and the mbed platform
Applications
Authentication of Internet of Things (IoT) device nodes
Securely updating IoT or network connected device configuration data
Data authentication at all levels from sensor endpoint to web server
Protect all types of network connected applications from counterfeiting
Invalidate unauthorized sensor endpoints
