Michael Backes Oana Ciobotaru Anton Krohmer RatFish: A File Sharing Protocol Provably Secure against Rational Users. 607-625 2010 ESORICS http://dx.doi.org/10.1007/978-3-642-15497-3_37 conf/esorics/2010 db/conf/esorics/esorics2010.html#BackesCK10