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APDU SELECT communication

JavaCard Applet Development Related Questions and Answers.
poinonche
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APDU SELECT communication

Postby poinonche » Tue Oct 17, 2017 11:53 pm

I am trying to figure out what data communications look like on the low level serial channel when APDU SELECT is sent via T=0, T=1 or T=CL.
I have reference material showing me the APDU SELECT packet format. But I wonder before it's sent over the channel, is the byte sequence for SELECT encrypted?

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mabel
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Re: APDU SELECT communication

Postby mabel » Wed Oct 18, 2017 10:10 pm

SELECT command itself for a Java Card is described on the application layer in the corresponding specifications. On the low level only the protocol (T=0/1: ISO7816-3, T=CL: ISO14443) is described . The APDU structure is described in ISO7816-4. The commands described are not supported with the exception of the GET RESPONSE command.

But I wonder before it's sent over the channel, is the byte sequence for SELECT encrypted?

No. For a java card the SELECT command is never encrypted. It has a well defined structure.


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