Java Card refers to a software technology that allows Java-based applications (applets) to be run securely on smart cards and similar small memory footprint devices. Java Card is the tiniest of Java platforms targeted for embedded devices. Java Card gives the user the ability to program the devices and make them application specific. It is widely used in SIM cards (used in GSM mobile phones) and ATM cards. wikipedia

• JavaCard SDK — Free from Oracle.

Eclipse

Remove the JRE system library and add the Java Card library. Set compiler level to 1.3 and bytecode compatibility to 1.1

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Shadysim is a collection of Makefiles and python scripts that makes it easy to compile and load SIM applets. See https://github.com/shadytel/sim-tools for more information.

• hello-stk - Hello world example demonstrating how to display a simple menu.
• toorcamp cryptochallenge applet - This applet was loaded onto every SIM handed out at Toorcamp 2012 and contained hints for the CryptoChallenge