Our Online Store have the new products: RFID antenna board. Currently it can work with JC10M24R and JCOP4 card chips.
Compared with normal cards, the antenna board module has a smaller size and fixed holes, which is easy to integrate in the IOT(Internet Of Things) project.

What's the difference between APDU and TPDU?

JavaCard Applet Development Related Questions and Answers.
BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

What's the difference between APDU and TPDU?

Post by BirdKing » Thu Jan 10, 2019 2:48 am

What's the difference between APDU and TPDU for javacard ?

User avatar
Ellisun
Posts: 50
Joined: Wed May 20, 2015 3:47 am
Points :472
Contact:

Re: What's the difference between APDU and TPDU?

Post by Ellisun » Mon Jan 14, 2019 5:48 am

The TPDU (Transport Protocol Data Unit) is a message encapsulation format where there are several bytes of routing header added to the front of the payload message.
The processing overhead of the TPDU has two components: the overhead TPDU and the overhead per byte.

The APDU (Application Protocol Data Unit) is the communication unit between a reader and a card. The structure of an APDU is defined by the ISO 7816 standards.
There are two categories of APDUs: command APDUs and response APDUs.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Sun Jan 27, 2019 8:45 am

thanks very much.
I want to implement CCID on APDU level. But I'm confused with that how to process PCB, NAD and so on ?

owlstead
Posts: 9
Joined: Sun Jan 27, 2019 10:57 am
Points :32
Contact:

Re: What's the difference between APDU and TPDU?

Post by owlstead » Sun Jan 27, 2019 5:48 pm

Yes, things like the NAD would be part of the TPDU, not the APDU. So that's not possible.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Mon Jan 28, 2019 7:45 am

And I need not process S block and R block too ?
Last edited by BirdKing on Mon Jan 28, 2019 7:49 am, edited 3 times in total.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Mon Jan 28, 2019 7:45 am

TPDU is without PCB. The S block and the R block should be absence. Oh, I'm so foolish.
But how to process the PPS?

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Sat Feb 16, 2019 9:53 am

On APDU level, CCID has a setParamters(0x61) command to set the GT, WT and protocol. So I think it doesn't need PPS.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Sat Feb 16, 2019 10:06 am

On APDU level, how to process wtx or 0x60?
In CCID specification I can see "If the ICC request time extension, by using a NULL proceduce byte (0x60) in T=0 protocol or S(wtx) in T=1 prptocol, the CCID informs the host of this request." But I annot understand very well.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Mon Feb 25, 2019 6:26 am

On APDU level, if the 8th word of pc_to_rdr_xfrblock is 0x0010 indicates the abData field is empty. This empty xfrblock could take place of s wtx in T=1 or T=0.

BirdKing
Posts: 86
Joined: Wed Nov 04, 2015 7:23 am
Points :656
Contact:

Re: What's the difference between APDU and TPDU?

Post by BirdKing » Mon Feb 25, 2019 6:28 am

The empty xfrblock also replace the ack in extend apdu.

Post Reply Previous topicNext topic

Who is online

Users browsing this forum: Google [Bot] and 56 guests

JavaCard OS : Disclaimer