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APDU

Application Programming Data Unit according to ISO7816. An APDU includes a CLA and INS byte to identify a certain command within a smartcard. It is sent to a smartcard to execute a specifc command.

Card Reader

A device to interface with a smart card. In this meaning it does not just allow to read a card but to communicate with a smartcard, which may include writing to card EEPROM. It is also called Interface Device (IFD).

See Also:  IFD, Interface Device
CLA

Class byte within APDU to identify, in conjunction with INS, a specific command.

See Also:  INS, APDU
IFD

Interface Device: A device to interface with a smart card also called card reader.

INS

Instruction byte within APDU to identify, in conjunction with CLA, a specific command.

See Also:  CLA, APDU
Interface Device

Interface Device (IFD): A device to interface with a smart card also called card reader.

See Also:  IFD, Card Reader