Security mechanism for sharing and distributing information in various groups of the next-generation

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This study develops fundamental technologies for sharing and distributing information in various groups of users The study covers two major subjects. In the group key management, we developed an algorithm which makes use of the Huffman algorithm and keeps the good efficiency for long term of use. In the authentication issue, we give a formal model of the cross-domain role-based access control mechanism, and developed a concrete scheme based on the hierarchical ID-based cryptosystem.