Jean-Paul Boly Antoon Bosselaers Ronald Cramer Rolf Michelsen Stig Fr. Mjølsnes Frank Muller Torben P. Pedersen Birgit Pfitzmann Peter de Rooij Berry Schoenmakers Matthias Schunter Luc Vallée Michael Waidner The ESPRIT Project CAFE - High Security Digital Payment Systems. 217-230 1994 conf/esorics/1994 ESORICS http://dx.doi.org/10.1007/3-540-58618-0_66 db/conf/esorics/esorics1994.html#BolyBCMMMPPRSSVW94