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NFCProxy is a an Android app that lets you proxy transactions between an RFID credit card and a reader. The saved transactions can be replayed to skim credit cards or the RFID credit card can be replayed at a POS terminal.
NFCProxy can also be useful for protocol analysis to learn about the underlying communication protocol.
In order to replay credit cards to a reader you MUST install a special version of CyanogenMod.
Java-RFID is a Java programming library for RFID. Its goal is to create an RFID kit-agnostic API ala JDBC. Thus, programmers will write the same code to communicate with any RFID kit. It has been tested with Texas Instruments and Microchip RFID kits.