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Stewart McCoy
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“The risk is that when you build a back door into systems, you’re not the only one to exploit it,” said Matthew D. Green, a cryptography researcher at Johns Hopkins University. “Those back doors could work against U.S. communications, too.”

Some of the agency’s most intensive efforts have focused on the encryption in universal use in the United States, including Secure Sockets Layer, or SSL, virtual private networks, or VPNs, and the protection used on fourth generation, or 4G, smartphones. Many Americans, often without realizing it, rely on such protection every time they send an e-mail, buy something online, consult with colleagues via their company’s computer network, or use a phone or a tablet on a 4G network.

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