bruce schneier is an expert and author of 12 security books.ys the tsa's 95% failure rate does not justify their budget. instead, the money should be spent on intelligence. bruce is with me here at def con. you are quite the celebrity here. a lot of people very excited about the talk you gave. i want to start with airlines. just how dangerous is this? bruce: we don't actually know. airlines are not immune to hacking just like any other industry. we are seeing a lot of attacks against personal information whether it is by government or criminals. we are all vulnerable. emily: could they take down a plane? bruce: that is a different kind of thing entirely. there is research done for attacks on vehicles. attacking planes remotely seems remote, but as things get computerized and then we don't know. emily: what about the tsa? you were very critical around them around 9/11. it does not sound like you are a fan. bruce: there have been tests where people try to bring weapons through checkpoints and the tsa has high failure rates. a high failure rate is