David Chaum. How to Keep a Secret Alive: Extensible Partial Key, Key Safeguarding, and Threshold Systems. In G. R. Blakley, David Chaum, editors, Advances in Cryptology, Proceedings of CRYPTO 84, Santa Barbara, California, USA, August 19-22, 1984, Proceedings. Volume 196 of Lecture Notes in Computer Science, pages 481-485, Springer, 1984. [doi]
Abstract is missing.