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Security and Trust Services API for J2ME

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The Security and Trust Services API for J2ME (SATSA) (JSR 177) is an optional package within Java ME that enables enhanced cryptographic and smart-card-based security for mobile applications. It includes APDU communication, Java Card RMI, general cryptography, and PKI features.[1][2]

Features

SATSA adds the following capabilities to Java ME:

  • Smart-card communication via ISO 7816 APDU.[3][4]
  • Remote invocation of Java Card objects via SATSA‑JCRMI.[5]
  • SATSA-Crypto supporting message digests, symmetric/asymmetric encryption, and signatures.[6][7]
  • SATSA-PKI for certificate-based digital signatures and secure user authentication.[8]

Components

SATSA is divided into four main components:

  • SATSA‑APDU: Low-level APDU communication for ISO/IEC 7816 smart cards.[6][4]
  • SATSA‑JCRMI: Java Card Remote Method Invocation.[5][3]
  • SATSA‑Crypto: Encryption, message digests, digital signature APIs.[9][7]
  • SATSA‑PKI: Secure key storage, certificate handling, digital signature verification.[8][6]

Implementation examples

APDU communication

APDUConnection conn = (APDUConnection) Connector.open("apdu:0");
byte[] response = conn.exchangeAPDU(command);

Used in smart card access systems for PIN verification and applet interaction.[6][10]

Java Card RMI

JavaCardRMIConnection jc = (JavaCardRMIConnection)
    Connector.open("jcrmi:0;AID=a0...c.8.1");
MyApplet stub = (MyApplet) jc.getRemoteObject();

Provides a high-level interface to smart card functionality.[5][7]

DES encryption

Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding");
c.init(Cipher.ENCRYPT_MODE, key, ivSpec);
c.doFinal(data, 0, data.length, out, 0);

Commonly used to secure local data or perform session encryption.[9][6]

Platform support and tools

SATSA is supported on selected devices from major manufacturers including Motorola, Nokia (from Series 40), Samsung, and Sony Ericsson (JP-8+).[11][12]

The Java ME SDK and Sun Java Wireless Toolkit include full SATSA emulation, including APDU/JCRMI over TCP/IP ports 9025 and 9026.[3][6]

See also

References

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