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Passcode Zero-days: Why these security flaws are so dangerous and expensive

Hackers hunt for them and governments around the world use them to carry out spy operations. What are zero-days and why are they increasingly valuable? 

Mario Anzuoni/Reuters

The National Security Agency practice of finding and hoarding zero-days – previously undiscovered security flaws in computer products – is generating a new wave of criticism from security researchers and tech companies. 

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