A cryptographic implementation for dynamic access control in a user hierarchy. - Hui-Min Tsai; Chin-Chen Chang 001 (Comput. Secur., 1995)

A Key Assignment Scheme for Controlling Access in Partially Ordered User Hierarchies. - Chin-Chen Chang 001; Iuon-Chang Lin; Hui-Min Tsai; Hsiao-Hsi Wang (AINA (2), 2004)

A dynamic mechanism for determining relationships in a partially ordered user hierarchy. - Chin-Chen Chang 001; Iuon-Chang Lin; Hui-Min Tsai (Int. J. High Perform. Comput. Netw., 2005)