there's the username would leak through the title. i want to do want other side before wrapping the topic on leakage and that's to say that in the term of art in the computer science community, leakage just refers to information between parties. leakage can be intentional in the examples i've been keeping today, i'm generally not taking a position on whether it is intentional or not. but here's a case where i think it is intentional, and to give an example that it does occur, there's a free online dating website, okay cupid that we looked at. when you go to okay cupid, when you go to this website, it tips off to companies with your gender, age, zip code, relationship status. strange enough how often you claim to use drugs, i'm not sure why they do that. it did occur to me that in the state of california that might be some relevance to advertisi advertising, at any rate, so intentional leakage can occur. okay, so there was a great study done by a few authors this year with a look at information language on partner websites. they signed

it may be somebody from his group who hijacked his username.e a list of all the parents stop predators volunteers, transcripts of their chatroom conversations. well, then may i take a look at that? a lot of names to go through, charlie. maybe instead of going through the names, why don't we go through the chat? what do you mean? well, it's just like any language. you know, on-line messaging has its own vocabulary and syntax. senders of these messages develop their own unique patterns of speech, which can then be analyzed using statistical linguistic analysis. it's like a jeweler beading a necklace. a jeweler chooses certain types of beads then strings them in a particular pattern according to his own unique, personal style, just like im senders will exhibit their own styles, patterns of speech which are unique to them. so, then we just compare them. yeah, to the transcripts of the volunteers for this "parents stop predators" group. look, if the killer is in that group, he will be betrayed by his own chat. amita. hey. hi. um, have you seen charl

you enter your username and pass ward but you're not really on your bank's site. a site that looks just like it. but it's a fake. >> so if you get an e-mail like that. >> the best thing to do, and this takes a little bit of extra time, and unfortunately that's sort of the security environment we're living in. don't click on a link in your e-mail program. open up your web browser, type in city bank, bank of america, ebay, facebook, whatever it is and logon directly from that so you know you're going directly to the website. you're not going to get misdirected along the way. >> we talked about facebook that says check to see who's looking at your profile. >> that's who they used to get a lot of people. if you look at something on facebook and a lot of apps want to have permission to access your facebook profile, and you usually say yes. if something looks a little funky, that could be someone wanting to take control of your facebook account. >> protect against internet blackouts. >> if you have to be online all the time, your internet service is going to go out occa