Karl Martin is the founder of Nymi, Inc., a company who wants to disrupt the field of "user authentication". In other words, how do you prove "you are you" to a machine? By using a simple password? Do you use the same one for everything? What if you could replace the need for passwords altogether and increase security? That's the goal of the Nymi Band. There are countless applications, including financial transactions at POS terminals as well as for online shopping. Not so good for action movie plot devices, though.