Hidenori Nakamura, Kazuyuki Takagi, Ken-ichi Okada, Yutaka Matsushita. Hierarchical group oriented key management method HGK. In Sixth Annual Computer Security Applications Conference, ACSAC 1990, 3-7 December, 1990, Tucson, Arizona, USA. pages 44-49, IEEE, 1990. [doi]
Abstract is missing.