In the ISO 7816-4 they say :
"For each command TPDU sent from the reader, a
response TPDU is sent by the card. The response
includes three mandatory fields and one optional field
(all one byte in length):
ACK
NULL
SW1
SW2
I'm using a serrial line sniffer, and I can't see
this response TPDU, I'm thinking that, maybe, the
card reader exchange with the card this response TPDU,
and the card reader does not forrward it to the host
side, so that I can see it as traffic between the
computer and the reader.
This response of any command TPDU is it sent or not
by the card?
Thank you!!
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