Earlier this year, the FBI abruptly ended a months-long acronymous legal battle with Apple to unlock the iPhone of a dead terror suspect. The bureau hasn't told anyone that much about how it finally got into the phone, but experts assume someone gave the feds a way in thanks to an unknown vulnerability, or "zero-day."The term zero-day can be used for two slightly different things. There are zero-day bugs, which are flaws in a software that even its developer doesn't know about, and zero-day exploits, which are hacking techniques designed to take advantage of the aforementioned bugs.
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