That should work. The whole point of using a binding key is that the data
can be encrypted outside the TPM, but decrypted inside.
-- per aspera ad astra --
On Tue, Jul 16, 2013 at 9:10 PM, Shu Zhang <[email protected]> wrote:
> Hello trousers users,
>
> I'd like to send a secret securely from a server to a client with TPM
> and make sure only the client with the TPM can get the secret. I
> wonder if something like this would work:
>
> 1. generate and register an RSA key pair on the client's TPM, copy its
> UUID as well as its public key to the server
>
> 2. when the connection between the client and server is established,
> the server encrypts the secret using the TPM public key, sends the
> encrypted secret and the UUID of the TPM key to the client
>
> 3. the client's TPM loads the TPM key using the UUID and unbinds the
> encrypted secret
>
> I understand Tspi_Data_Unbind can unbind data encrypted with
> Tspi_Data_Bind using the same key, but would it also work with data
> encrypted outside TPM? I'm guessing if the same decryption algorithm
> is used as the encryption, then it would, but I don't know much about
> RSA.
>
> Thank you.
>
> Shu
>
>
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