Heartbleed Sheds Light on NSA's Use of Bugs

The Wall Street Journal (online registration required): The turmoil caused by the "Heartbleed" encryption bug is shedding light on a little-known element of the White House's surveillance overhaul package: how the government handles software holes and vulnerabilities.

The National Security Agency has compiled a list of software bugs and holes known as "zero days," which the agency has exploited to gain access to secure networks before they can be fixed.

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