Peter Tomlinson schrieb: > jackie wong wrote: > >> Dear all, >> >> I have some question to ask on T=1 protocol card. >> 1. Is T=1 card has higher speed than T=0 card? Why? >> 2. Is T=1 card has higher security than T=0 Card? Why? >> >> Any advantage of T=1 protocol compare to T=0 protocol other than >> ability of T=1 card to handle class 4 APDU. >> >> Regards, >> claran >> > There's a very interesting discussion going on, but have any of you > replied off list to try to answer Jackie's questions? I'm a bit out of > my depth with the technical detail needed to answer, but my gut feeling is: > > 1. potentially yes, particularly where Class 4 APDUs are in use: more > efficient processing is possible in both card and terminal (Andreas, > care to comment?) There should be no big difference in speed between T=0 and T=1. T=1 needs some more bytes for the framing of blocks, but therefore can handle case 4 APDUs in a single step. The underlying asynchronous transmission is the same.
The advantage of T=1 is a somewhat cleaner protocol stack. The transmission layer (T=1 frames) is independent of the application layer (7816-4 APDUs). It also provides a mechanism to exchange data between different nodes, however this is not really for smart card, but more for card reader communication. The MCT specs (CT-API and such) use T=1 as default communication mechanism between a card reader and a PC. ISO 14443 (Contactless Smart Card) also uses a protocol derived from T=1. > 2. no: neither protocol is secure (you need to invoke secure channel for > privacy, and use checksums or similar for integrity) > > I do remember, over 10 years ago, getting a colleague to work out the > state diagram for T=1. He found that it was not completely closed and > thus there could be a hang-up under some error conditions - it needed a > global timeout function added, which I'm sure is what the best > implementations in terminals do. > > Peter > > > _______________________________________________ > Muscle mailing list > Muscle@lists.musclecard.com > http://lists.drizzle.com/mailman/listinfo/muscle -- --------- CardContact Software & System Consulting |.##> <##.| Andreas Schwier |# #| Schülerweg 38 |# #| 32429 Minden, Germany |'##> <##'| Phone +49 171 8334920 --------- http://www.cardcontact.de _______________________________________________ Muscle mailing list Muscle@lists.musclecard.com http://lists.drizzle.com/mailman/listinfo/muscle
