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?)
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
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