We made this two cents just for fun and because we love BackTrack. All the research and implementation was made by other people and communities and is publicly available. This article contain no original research.NOT to be used in illegal circumstances (for example to abuse, hack or trick a system which the reader does not have specific authorizations to such as ticketing systems, public transport, University/ISIC cards, building access systems or whatsoever systems using Mifare Classic as core technology).As-is without any warranty, support or liability - any damages or consequences obtained as a result of consulting this information if purely on the side of the reader.For informational use only as part of academic or research study, especially in the field of informational security, cryptography and secure systems.DISCLAIMER: The information and reference implementation is provided: