CNN news 2014-03-26 加文本

cnn news 2014-03-26

AZUZ: Pasteur`s germ theory of fermentation goes a little deeper than the five second rule, but some researchers in Britain say that rule is not entirely an urban myth. Here`s what they did: they dropped food on the floor for different amounts of time. And then picked it up to see how much bacteria was on it. They found that time does factor in that food that set for a few seconds on the floor was likely to have less bacteria on it than food that set for longer. In their study, the type of floor mattered. Carpeted floors were least likely to transfer bacteria. Laminate or tiled floors were most likely.

But while that and the five second rule do count for something, the lead professor on the study said, any dropped food can pick up infectious bacteria depending on how nasty the floor is.

You probably heard the reports that public Wi-Fi, free Internet connections at airports and coffee shops isn`t always secure. That a hacker could use it to tap into your phone or computer. But as technology gets more and more advanced, your personal information could be at risk while you`re just working around with Wi-Fi turned on.

(BEGIN VIDEO CLIP)

GLENN WILKINSON, SECURITY RESEARCHER, SENSEPOST: Three devices, or three mobile phones down below, and are collecting data about at least three people.

UNIDENTIFIED FEMALE: That`s a hacker. He`s using technology installed on a drone to grab cell phone information from people below. This technology is being used on cell phones and laptops. One day, it could be installed in a larger aircraft. Think helicopters or small planes.

WILKINSON: And down the road, and I see lots of devices, it must be the people walking down the road.

UNIDENTIFIED FEMALE: He can also see your user names, passwords, credit card information and get this - in some cases, your home address.

WILKINSON: So, somebody who`s walking in the park, that`s most likely their house. One of these houses here.

UNIDENTIFIED FEMALE: The tech on the drone is called snoopy. We took snoopy out for a spin on the streets of London.

WILKINSON: They will fly within a relative close distance of a person with a phone tucked safe in their pocket. And if they`ve left their Wi-Fi on, which most people do in my experience, the phone will very noisily be shouting out the name of every network that`s ever connected to you. So, it`ll be shouting out Starbucks, are you there.

UNIDENTIFIED FEMALE: You can protect yourself by turning off your Wi-Fi. But if you don`t, Snoopy can trick your phone and send back a signal pretending to be the network the phone is looking for. Then, the drone can intercept everything the phone sends and receives.

WILKINSON: Your phone is looking for Starbucks, and I pretend to be Starbucks. Your phone connects to me and then I can see all of your traffic.

UNIDENTIFIED FEMALE: We tested it out on some dummy accounts we created.

WILKINSON: And we can see here as logging to yahoo.com. Yahoo mail, and I created an account. Angela Smith and there`s the user name, and the password is ABC123. And so, here`s Amazon, also for PayPal. So, PayPal, email address, user name.

UNIDENTIFIED FEMALE: Wilkinson is an ethical hacker. He built the snoopy drone to highlight insecurities in smart devices. In a world were drones fly and tech enables them to potentially spy, it`s more important than ever to protect your data.