8 Using Extended APDU
This chapter describes the Extended APDU and how it can be used to allow large amounts of data to be sent to the card, processed appropriately, and sent back to the terminal.
The Extended APDU feature is especially beneficial to applications that deal with large amounts of information, such as signature verification, biometrics verification, and image storage and retrieval. These are more easily implemented if the underlying transport protocol is T=1. Applets developed for T=0 cards need special logic and care to work correctly.
This chapter includes the following topics: