The card itself cannot go quite as fast as a serial terminal interface... maybe half the speed (though it looks closer to 9600 baud then 19.2k, or 38.8k). The only justification for putting the card reader on the USB is because a number of systems are beginning to show up without serial terminal interfaces.
Hitachi engineers, in Firewire and USB 2, also provide a packet-bus mechanisms to create:
A ``single trusted system'' network ... that ...implements a refer- ence monitor to enforce the access of subjects to objects in accordance with an explicit and well defined network secu- rity policy. The network has a single trusted computing base, referred to as the Network Trusted Computing Base (NTCB), which is partitioned (see section I.4.2) among the network components in a manner that ensures the overall net- work security policy is enforced by the network as a whole.
There is more to the USB issue than CCID and modern signalling. Its how the device appears on one of n "trusted bus(es)". Its this which makes the TCPA TPM out of date, before its even out there. There can be several control-masters in modern trusted bus, we dont need to be limnited to a "monolithic" TPM security kernel that guages whether the reader (driver) is trustworthy.
Peter.
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