On Mon, Oct 15, 2007 at 10:23:22PM +0200, Alon Bar-Lev wrote:
> This has nothing to do with TSPI... As you need passphrase to access
> TSPI, right? And what do you do with this passphrase? Having a
> security credentials without "something you know" somewhat make the
> whole idea redundant.

TSPI seals your key to a system state, based on the PCR values of the
TPM. There is no additional protection of the key (or, more
accurately, of the ability to use the key) beyond the PCR values
having to match. The secret key is always locked in the TPM; no matter
what information is in the user's session keyring, it is useless
unless the system's PCR values are set correctly.

Mike

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