Voice based interfaces are growing in popularity, complexity and influence. But securing these interfaces has, thus far, been an afterthought. If we are destined to interact with the smart systems around us using our voice, how exactly will we manage to authenticate to those devices? In this podcast we speak with Ben Rafferty of the firm Semafone about the challenges of securing voice-based systems. Semafone won the recent PAYMNTS.com Voice Challenge with a way to use Amazon’s Alexa voice assistant as an out of band authentication mechanism.