Ariel -
Do you know whereon the hard drive the encrypted "blobs" of TPM-encrypted
storage keys are stored? Either on Linux or Windows? I've trying to find out
without success.
On Wed, Aug 31, 2011 at 10:57 AM, Segall, Ariel E <[email protected]> wrote:
> Yes. From the TPM perspective, those blobs are just handed to the user
> when you create a key; it doesn't care which software is providing the
> blob when it's used. The system was designed so that restoring from a
> backup in the event of hard drive failure, OS replacement, or other
> user-level software change is entirely feasible.
>
> If you have software doing automated key management, the only real
> question is how that software handles restoring from a backup; the TPM
> will not cause problems.
>
> Ariel
>
> On 8/31/11 10:50 AM, "Olga Chen" <[email protected]> wrote:
>
> >On Wed, Aug 31, 2011 at 10:44 AM, Segall, Ariel E <[email protected]>
> >wrote:
> >
> >
> >Olga: The TPM itself has no on-disk key storage, although some
> >applications may use the disk for key storage in an automated fashion. You
> >are correct that the TPM only stores that limited set of keys inside the
> >chip.
> >
> >This means that in the event of a hard-drive failure, the SRK should still
> >be accessible, but any storage (or other user-created) keys that were on
> >the hard disk will be lost unless they were backed up. However, the
> >backups should be restorable without any trouble from the TPM perspective,
> >and as you say, owner-evict keys are an exception.
> >
> >
> >
> >So if I find where the TPM stores the encrypted "blob" with all the
> >storage keys, copy it somewhere else, then re-install the OS, and then
> >copy the "blob" back, I should be able to use the same keys?
> >
> >
>
>
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