TPMs have come as standard with nearly all computers (except Macs, doh) for
a long time. They certainly don't cost $100. More like a few dollars at
most. That's why they're so slow.
On Tue, Jul 30, 2013 at 10:43 PM, grarpamp <grarp...@gmail.com> wrote:
> On Tue, Jul 30, 2013 at 8:12 AM, Mike Hearn <m...@plan99.net> wrote:
> > The TPM is a piece of secure* hardware
>
> I've seen some motherboards with a TPM module header but none
> came with it installed. I think the modules themselves might be
> $50-$100 range. They might come with some API docs.
> Some of you might have links to ones you've used...
>
> > As part of that role, the TPM provides some permanent storage in the form
> > of NVRAM. Because the TPM is designed to be as cheap as possible, it has
> a
> > limited number of write cycles. Normally you're meant to store Intel TXT
> > launch control policies and sealed keys there
>
> > the goal is to avoid wearing down the drive and extend its useful life.
> > Normally it doesn't matter, but if you want to delete data such that it's
> > really really gone, it obviously poses a problem. Using TPM NVRAM solves
> > it, albiet, at a high usability cost.
>
> If said TPM storage has a 'limited [but unfixed number of write cycles',
> that
> sounds unreliable. It would seem to me that both reliable and 'really gone'
> are achievable on platters (or lesser, with ssd) provided the disk was also
> encrypted. Nuke that key and it's reliably gone.
>
>
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