>> if it comes from somebody i know it's okay to open that. >> no. >> so how do i communicate with people? >> people that you know, if you and i are having dialogue i might click links and i'll engage in that. but if i get an e-mail from my bank saying hey your statements ready. click on this link to access your statement. i'm not going to click that link. it's so con convenient to click that link and bad guys know that. if you type into it the address bar or go to your favorites menu, these extra steps you might take protect you. >> you say slurp up the information. >> if you use a wireless network you have to have encryption. >> yes. >> so public wifi, airports, hotels out in the open. i can see your data as it's transmitting through the air. >> but if i'm on free wifi i don't give out my credit card numbers that way. >> well, some people do, right? >> yeah. >> so as long as i don't, i'm okay. >> they can't crawl into the computer and get other stuff. >> your operating system is