Abstract: By constructing two special polynomials,a new multicast key management (MKM) scheme-Hash Function-based Multicast Kcy Management (HFMKM) scheme was proposed,which was based on hash function and two-variable one-way function. The properties of both centralized and distributed were combined in this scheme, so it overcame the defect of conventional centralized flat schemes, whose security totally depended on the Group Controller CGC). With Comparing and analyzing it with GKMP scheme, the results showed that the HFMKM scheme obviously improved the security and the overall performance. It is a new security MKM scheme.

Key words: Hash function, Two-variable one-way function, Key management, Secure group communication, Forward confidentiality, Backward confidentiality