Some workers in low-income countries are choosing bitcoin, a virtual currency powered by blockchain technology, to send money to their families. It's cheaper, faster and doesn't require a middleman.
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A Yahoo sign at the company's headquarters in Sunnyvale, Calif. The company has announced a hacking of user accounts that happened in 2013, but it says payment card information was not accessed.
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The Nest thermostat is an Internet-connected device. Security technologist Bruce Schneier says that while Internet-enabled devices have immense promise, they are vulnerable to hacking.
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People walk past a TV screen showing a poster of Sony Picture's "The Interview" in a news report, at the Seoul Railway Station in Seoul, South Korea. The FBI says North Korea hacked into Sony Pictures computer systems as retribution for the film.
Dartmouth College researcher Timothy Pierson holds a prototype of Wanda, which is designed to establish secure wireless connections between devices that generate data.
Eli Burakian/Dartmouth College
A pedestrian walks by an Apple store in New York City on Feb. 23. Protesters demonstrated against the FBI's efforts to require the company to make it easier to unlock the encrypted iPhone used by Syed Rizwan Farook.
Secretary of Defense Ash Carter (left) says the Pentagon's new hacker program will strengthen America's digital defenses. Carter is seen here with the chairman of the Joint Chiefs of Staff, Gen. Joseph Dunford.
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Authorities say several publicly traded companies, including Clorox, Caterpillar and Viacom, had press releases stolen and used to implement an insider-trading scheme.
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Chris Valasek (left) and Charlie Miller talk about hacking into vehicle computer systems during the Black Hat USA 2014 hacker conference in Las Vegas last August.
Adm. Michael Rogers, NSA director and head of the U.S. Cyber Command, has avoided singling out China for blame in the OPM hack, which may affect as many as 18 million federal workers.
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