A killer application is any product or service incorporating a particular innovation that makes the innovation economically successful. There has been a feeling among information security professions that PKI lacks adoption momentum because it does not have a killer application. Do you see a killer application of PKI? What is your assessment of the rate of adoption of PKI by businesses? In what types of applications are PKI-based solutions showing promise? What are some of the problems o hurdles PKI still needs to overcome?