<div dir="ltr">In fairness, you never did need special hardware to verify an RA; that was half the point.<div><br></div><div>SGX also lets you attest application software, which is usually what people care about on the open Internet. Frankly, I think that's its biggest selling point.</div><div><br></div><div>(TXT is great if you're a datacenter infrastructure operator, where it's basically a really nice pseudo-secure-boot measure that also gives you nice guarantees for your encrypted hard disk, but it's mostly useless for non-systems tasks.)</div><div><br></div><div>I'd be interested to know if the group sig scheme is the same, or substantially similar to the, one as used in Direct Anonymous Attestation.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 26 August 2015 at 13:14, Mike Hearn <span dir="ltr"><<a href="mailto:mike@plan99.net" target="_blank">mike@plan99.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Yeah, TPM / TXT based RA has always been a half-baked joke. I am not surprised Intel ran out of patience with the wider ecosystem and just decided to do it all themselves. SGX looks a lot easier to program and much more likely to actually work than prior attempts. The fact that it solves memory bus attacks and is fully on-die is the icing on the cake.<div><br></div><div>Interestingly, SGX chips identify themselves using a group signature scheme. Thus they can prove they are issued by Intel without providing any kind of unique identifier. It's called EPID:</div><div><br></div><div><a href="http://csrc.nist.gov/groups/ST/PEC2011/presentations2011/brickell.pdf" target="_blank">http://csrc.nist.gov/groups/ST/PEC2011/presentations2011/brickell.pdf</a><br></div><div><br></div><div>So in theory you won't need any special hardware to verify an RA, just to generate one.</div><div><br></div><div>I am guessing the earliest that ordinary Joe's like me will get to play with SGX is next year at best. Right now it seems to be in some sort of private testing period.</div></div>
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