Maxim Integrated / Mbed OS MAXREFDES155#

DeepCover Embedded Security in IoT: Public-key Secured Data Paths

Dependencies:   MaximInterface

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.

More information about the MAXREFDES155# is available on the Maxim Integrated website.

--- a/Bitmap.hpp	Thu Apr 06 15:19:57 2017 -0500
+++ b/Bitmap.hpp	Mon Apr 10 11:55:33 2017 -0500
@@ -50,7 +50,7 @@
         ScanLineFormat ///< Traditional left to right scan line format.
     };
     
-    /// Number of pixels contained in a segmnt.
+    /// Number of pixels contained in a segment.
     static const int pixelsPerSegment = 8;
     
     /// Construct a bitmap with specified dimensions and optionally load from byte array.
@@ -83,6 +83,14 @@
     /// @param srcY y-coordinate location to overlay.
     void overlay(const Bitmap & src, int srcX, int srcY);
     
+    /// Reset to initial state.
+    void clear();
+    
+    /// Reset region to initial state.
+    /// @param x,y Coordinates to begin clearing at.
+    /// @param width,height Dimensions of the cleared region.
+    void clear(int x, int y, int width, int height);
+    
 private:
     int m_width;
     int m_height;