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I have to say, the Spectre exploit is a beautiful concept, utterly astonishing in its universal applicability across decades of technology. It is the software equivalent of using a stethoscope to crack a safe. There's no way to fix it but buy a new safe.
@photopuck fwiw the scholarly paper on the attack vectors is surprisingly readable; the first section is, references aside, a better introduction to the problem for laypeople than most of the popular media's attempts to explain it.
