As I read it, the CA e-Trust solutions, like RSA's ClearTrust will fit very nicely into the TCG paradigm that is/will become Trusted Computing/Trusted Web Services.
All this software will require the TCG hardware security solution (TPMs). I believe SKS is quite content to see this stuff rolling out so that by the time Longhorn is ready there will be a mryiad of applications requiring TPM support and network attestation.
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