FIGURE 7-19. SMS message alert from IFTTT
Security Evaluation
We now have a working prototype of a wireless doorbell that sends an SMS message when
pressed. Now is a good time for us to pause and think about security. An IoT product that is
susceptible to vulnerabilities can put potential customers at risk and also taint the perception
of the manufacturing company. To approach our analysis, we will first go through security
issues we have identified in other IoT products and see if our prototype is vulnerable to simi-
lar issues. We will then discuss additional security mechanisms that can be implemented to
further secure the prototype and leverage existing IoT security frameworks to make sure our
approach is comprehensive.
204 CHAPTER 7: SECURE PROTOTYPING—LITTLEBITS AND CLOUDBIT