koontzd@lrcs.loral.com (David Koontz )>
I've been saying it can be done for more than a year. I wrote a C model of some operating code for the chip. The clipper chip has save and restore commands that are used to dump and restore the LR register (crypto state). You keep your own LEAF and feed it back to the chip. You take the initial value of the LR register after IV generation and reload, it contains the IV. You exchange IVs with the distant end, who has also feed his own LEAF back to his chip. You have achieved crypto sync.
Where did you get the information about the internals? I've seen no references at all.
2) There might be anti-tamper features (re: FIPS Pub 140-1), causing loss of crypto variables (say for key exchange). It might be possible the TSD won't operate it all if security features are tripped. (unlikely, when you consider mechanical switches might bounce when one of these is thrown is a briefcase).
Hmm- a lot of the pay-TV cable boxes have security like that, and they work just fine. ************************************************** * Allen J. Baum tel. (408)974-3385 * * Apple Computer, MS/305-3B * * 1 Infinite Loop * * Cupertino, CA 95014 baum@apple.com * **************************************************