Programming Tools for Cracking Mifare Published

Via Heise Security -

A hacker using the pseudonym Bla has published an open source tool called Crapto1 for cracking the encryption of the Mifare Classic RFID chip, as used in the Oyster Card. Besides an implementation in C of the vulnerable Crypto1 algorithm, the archive also contains the C source code for an attack that has been described in a paper by Dutch security researchers at Radboud University.

Using the tool it is said to be possible to calculate the access code of a Mifare Classic card within around two seconds. All an attacker requires is a live recording of an encrypted radio communication between the card and a legitimate reader, as well as a little programming knowledge. The access code then allows him not only to decode the encrypted data, but also to manipulate the card's content virtually without limit and to clone it to obtain services fraudulently.