Canadian-born Omar Khadr is seen in a courtroom sketch during a 2010 hearing at the U.S. military prison at Guantanamo Bay, Cuba. He was moved to a Canadian prison in 2012. Janet Hamlin/AP hide caption

itoggle caption Janet Hamlin/AP

Japanese Prime Minister Shinzo Abe with U.S. Defense Secretary Ash Carter earlier this month in Tokyo. Abe's visit to the U.S. this week features an agreement for the Japanese military to have a more active role. Franck Robichon/AP hide caption

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Biometrics are increasingly replacing the password for user identification. iStockphoto hide caption

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Former Blackwater security guards were sentenced Monday for the shooting of dozens of Iraqi civilians in Nisour Square in Baghdad, Iraq. The square is seen here on Sept. 20, 2007, four days after the incident. Khalid Mohammed/AP hide caption

itoggle caption Khalid Mohammed/AP

Deputy Chief Mark Saunders speaks at a news conference in Toronto on Tuesday. A mysterious tunnel discovered in Toronto near one of the venues for this summer's Pan American Games contained a rosary with a crucifix and poppy. Police said there is nothing to suggest the tunnel was linked to criminal activity. Aaron Harris/Reuters/Landov hide caption

itoggle caption Aaron Harris/Reuters/Landov

They might be hard to remember sometimes, but good passwords may be the best defense against hackers. iStockphoto hide caption

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Internet-connected cars can put your privacy and security at risk, according to a new report from Sen. Ed Markey, D-Mass. Robyn Beck/AFP/Getty Images hide caption

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Michael Calce, who went by the online name Mafiaboy when he launched a massive cyberattack at the age of 15, now works as a security consultant for companies trying to protect their online systems. Vincenzo D'Alto/Courtesy of Michael Calce hide caption

itoggle caption Vincenzo D'Alto/Courtesy of Michael Calce

To protect against fraud, U.S. banks will be issuing credit cards with small computer chips. But some experts say using a PIN to complete a transaction is more secure than a signature. iStockphoto hide caption

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Particles of H5N1 virus — a particularly dangerous type of bird flu that can infect people — attack lung cells. Chris Bjornberg/Science Source hide caption

itoggle caption Chris Bjornberg/Science Source

Google is among several companies putting money into a fund to help safeguard the Internet from possible security flaws in open-source software. Marcio Jose Sanchez/AP hide caption

itoggle caption Marcio Jose Sanchez/AP