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In a first, researchers extract secret key used to encrypt Intel CPU code – Ars Technica

Hackers can now reverse engineer updates or write their own custom firmware.

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Researchers have extracted the secret key that encrypts updates to an assortment of Intel CPUs, a feat that could have wide-ranging consequences for the way the chips are used and, possibly, the way theyre secured.
The key makes it possible to decrypt the microcode updates Intel provides to fix security vulnerabilities and other types of bugs. Having a decrypted copy of an update may allow hackers to reverse engineer it and learn precisely how to exploit the hole…

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