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What's the difference between APDU and TPDU?

JavaCard Applet Development Related Questions and Answers.
BirdKing
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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 ?

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Ellisun
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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.

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