The Dining Cryptographers in the Disco: Unconditional Sender and Recipient Untraceability with Computationally Secure Serviceability

In Journal of Cryptology 1/1 (1988) 65–75, CHAUM describes a beautiful technique, the DC-net, which should allow participants to send and receive messages anonymously in an arbitrary network. The untraceability of the senders is proved to be unconditional, but that of the recipients implicitly assumes a reliable broadcast network. This assumption is unrealistic in some networks, but it can be removed completely by using the fail-stop key generation schemes by WAIDNER (these proceedings). In both cases, however, each participant can untraceably and permanently disrupt the entire DC-net.