1. 21. September 2008: Using an AVR as an RFID tag by Author Beth (Micah Dowty) and version 1.0 of the avrfid.S . Also found as the Emulator RFID.
  2. 15. June 2010: AVRFID 1.1 Firmware by Author Beth (Micah Dowty) version 1.1 of the avrfid.S which incoporates a few patches by Luke Koops who improved the FSK modulation for HID tags, so that the resulting waveform is much more regular and Cesar Fernandez who described the HID card format in more detail.
  3. 16. May 2011: Duct Taped AVRFID by Author Beth (Micah Dowty) uses her version 1.1 avrfid.S
  4. November 2011: AVRFID PCB Implementation by Daniel Smith
  5. September 2012: RFID Spoofing by Eric Barch who only uses Beth’s (Micah Dowty)  HID part of her version 1.1 avrfid.S .
  6. 1. December 2012: AVRFID 1.2 Firmware last update by Daniel Smith on his version 1.2 of Beth’s avrfid.S which adds support for 35 bit HID Corporate 1000 format and fixed 26 bit parity.
  7. 27. December 2012: AVR RFID Multipass by Trammell Hudson of the NYC Resistor hacker collective, which come up with an optimized version of Beth’s version 1.2 avrfid.S and convert it to C ending in the avrfid2.c file. Beth (Micah Dowty) welcomes this transition as it uses less of the 8kB flash memory of the AVRs etc… and has an nice application scenario of an action figure, whose body parts trigger different IDs in the AVRFID tag. The whole code in C for latest AVRFID tag and the reader can be found here. In his post Hudson also describes how easy it is to reprogramm AVRs with some Bus Pirate Tools, which provide an recovery clock. But a few patches are still needed!
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