Yvo Desmedt, Yongge Wang. Approximation Hardness and Secure Communication in Broadcast Channels. In Kwok-Yan Lam, Eiji Okamoto, Chaoping Xing, editors, Advances in Cryptology - ASIACRYPT 99, International Conference on the Theory and Applications of Cryptology and Information Security, Singapore, November 14-18, 1999, Proceedings. Volume 1716 of Lecture Notes in Computer Science, pages 247-257, Springer, 1999.
Abstract is missing.