As you may know, the TPM (Trusted Platform Module), which resides on the LPC bus, allows the storage and retrieval of encryption keys and certificates securely.
Within this Trusted Computing concept, however, is it actually secure? (Base-line question, please keep reading)
I have found that TPM 1.1 transmits encryption keys and certificates over the LPC bus in plain text. (1)
Is this true for recent versions of TPMs (1.2, 2.0)? If not, how is it that they've mitigated this issue? I see no way for this to be feasibly fixed.
1: "The authors (Schellekens et al.) of [an LPC MITM attack with a TPM] passively analyzed the communication of version 1.1 TPMs with the remaining platform and observed that certain operations like unsealing used to transmit TPM protected secrets in plain over the LPC bus." ~ A Hijacker’s Guide to the LPC Bus, page 186