Koichi Koizumi Takaaki Mizuki Takao Nishizeki A Revised Transformation Protocol for Unconditionally Secure Secret Key Exchange. 187-221 2008 42 Theory Comput. Syst. 2 http://dx.doi.org/10.1007/s00224-007-9052-3 db/journals/mst/mst42.html#KoizumiMN08