Hideki Imai Ronald L. Rivest Tsutomu Matsumoto Advances in Cryptology - ASIACRYPT '91, International Conference on the Theory and Applications of Cryptology, Fujiyoshida, Japan, November 11-14, 1991, Proceedings ASIACRYPT Lecture Notes in Computer Science 739 Springer 1993 3-540-57332-1 db/conf/asiacrypt/asiacrypt91.html