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The Internet's most dangerous sites

Some things just shouldn't be connected to the Internet. With Shodan, a search engine that finds connected devices, it's easy to locate dangerous things that anyone can access without so much as a username or password.

A hydroelectric plant

hack turbine
Wait, does that say kilowatts?

French electric companies apparently like to put their hydroelectric plants online. Tentler found three of them using Shodan.

This one has a big fat button that lets you shut off a turbine. But what's 58,700 Watts between friends, right?

It's not just France that has a problem. The U.S. Department of Homeland Security commissioned researchers last year to see if they could find industrial control systems for nuclear power plants using Shodan. They found several.

Tentler told DHS about all the power plants he found -- actually, DHS called him after he accessed one of their control systems.

  @DavidGoldmanCNN - Last updated May 02 2013 09:52 AM ET