THE Security and Trust Services APIs (SATSA) are defined by JSR 177. SATSA actually contains four separate APIs. Two of these are for communicating with smart cards, while the other two relate to cryptography.
SATSA-APDU is an API for communicating with a smart card using basic data packets called Application Protocol Data Units (APDUs).
SATSA-JCRMI is also about smart card communication but is based on Java Card Remote Method Invocation, a distributed computing protocol based on Java SE’s Remote Method Invocation (RMI).
SATSA-PKI provides methods for using a smart card to generate digital signatures and manage certificates.
SATSA-CRYPTO is a compact API for general-purpose cryptography, including message digests, ...