I am just writing my own code and sometimes using tpm-tools on Linux. I know
that when I create a key that is a "child" of the SRK, it is stored
somewhere on the hard drive. I didn't know you can indicate a filename to
store partictular blobs!
On Wed, Aug 31, 2011 at 6:00 PM, Segall, Ariel E <[email protected]> wrote:
> The answer really depends on the software you're using. What programs are
> you using to create and manage TPM keys? Perhaps someone on the list has
> experience with specific applications.
>
> The programs that I've used and written all delegate blob storage and
> backup to the user (user specifies filenames to store particular blobs
> in), so I'm not sure I can help much with a generic search for keys.
>
> Ariel
>
> On 8/31/11 1:29 PM, "Olga Chen" <[email protected]> wrote:
>
> >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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