How To Break and Repair A "Provably Secure" Untraceable Payment System.

Birgit Pfitzmann Michael Waidner How To Break and Repair A "Provably Secure" Untraceable Payment System. 338-350 https://doi.org/10.1007/3-540-46766-1_28 1991 conf/crypto/1991 CRYPTO db/conf/crypto/crypto91.html#PfitzmannW91