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smart card application protocol data unit : ウィキペディア英語版
smart card application protocol data unit
In the context of smart cards, an application protocol data unit (APDU) is the communication unit between a smart card reader and a smart card. The structure of the APDU is defined by ISO/IEC 7816-4 ''Organization, security and commands for interchange''.
==APDU message command-response pair==

There are two categories of APDUs: command APDUs and response APDUs. A command APDU is sent by the reader to the card – it contains a mandatory 4-byte header (CLA, INS, P1, P2) and from 0 to 255 bytes of data. A response APDU is sent by the card to the reader – it contains from 0 to 65 536 bytes of data, and 2 mandatory status bytes (SW1, SW2).

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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