Leo and I discuss the history, purpose, and value of personal firewall leaktesting. We examine the myriad techniques clever developers have found for accessing the Internet and sending data out of PCs even when those PCs are being protected by outbound-blocking personal firewalls.

Leo and I discuss questions asked by listeners of previous episodes. We tie up loose ends, explore a wide range of topics that are too small to fill their own episode, clarify any confusion from previous installments, and present real world 'application notes' for any of the security technologies and issues we have previously discussed.

Leo and I talk with Michael Vergara, PayPal's Director of Account Protections, to learn everything they can about the PayPal security key effort and its probable future.

Leo and I open the Security Now mailbag to share and discuss the thoughts, comments, and observations of other Security Now listeners.

Leo and I explore the Internet's rapidly growing need to automatically differentiate human from non-human automated clients. We discuss the advantages and limitations of many past and current approaches to this problem while paying close attention to the most commonly used visual 'CAPTCHA' solutions.

Leo and I discuss questions asked by listeners of previous episodes. We tie up loose ends, explore a wide range of topics that are too small to fill their own episode, clarify any confusion from previous installments, and present real world 'application notes' for any of the security technologies and issues we have previously discussed.

Leo and I explain the virtues and misbegotten negative reputation of the entirely benign and extremely useful emergent crypto facility known as the "Trusted Platform Module."

Leo and I discuss the user experience and operation of Microsoft's "CardSpace" technology which hopes to completely change the way users identify themselves on the Internet by doing away with traditional usernames and passwords.

Leo and I discuss the recent news of the FBI's announced crackdown and pursuit of 'bot-herders' who individually control networks of remote control DoS and Spam zombies numbering in the many tens of thousands.

Leo and I discuss questions asked by listeners of previous episodes. We tie up loose ends, explore a wide range of topics that are too small to fill their own episode, clarify any confusion from previous installments, and present real world 'application notes' for any of the security technologies and issues we have previously discussed.