- 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).
- CLA
Class byte within APDU to identify, in conjunction with INS, a specific command.
- 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.
- Interface Device
Interface Device (IFD): A device to interface with a smart card also called card reader.