then snapchat had to fend off an attack. not before hackers posted user names and phone numbers for 4.6 million members. last month, remember the huge security breach at target with all kinds of financial information stolen from millions of shoppers? can the hackers be stopped or will they always be one step ahead of authorities? peter singer is here to help us understand this. he's the co-author of cybersecurity and cyberwar, what everyone needs to know, and he joins me from washington. peter, welcome to you. and you know, given the recent hacking, even if you're one of the americans who thinks, no problem. i haven't fallen victim. i haven't been hacked, is this something every american needs to really start worrying about? >> as long as they're on the internet, yes, most definitely. look, we need to worry about it, but we also need to understand that it's something to be managed. it's a lot like the story you were having about the big snow storm in boston. it's something to be concerned