Other uses of TCPA
Eugen Leitl
eugen at leitl.org
Sun Aug 4 02:54:14 PDT 2002
On Sat, 3 Aug 2002, James A. Donald wrote:
> The TPM has its own secret key, it makes the corresponding public
> key widely available to everyone, and its own internal good known
> time. So when your customer's payment goes through, you then
Trusted time is a useful concept. I presume the time is set by the
manufacturer. Given current clock accuracy and limited lifetime of backup
power I presume it is possible to adjust the time via trusted timeservers.
Do they mention anything like this in the specs?
> send him a copy of your stuff encrypted to his TPM, a copy which
> only his TPM can make use of. Your code, which the TPM decrypts
> and executes, looks at the known good time, and if the user is
> out of time, refuses to play.
Is there any reason to believe the implementers are telling us everything,
and will implement the specs as advertised? I mean, consider the source.
Sometimes it makes sense to look a gift horse in the mouth, especially if
it's made from wood.
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