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hierarchical group key management 分级密钥管理
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At present, group key management mainly divided into centralized, distributed and hierarchical forms, all of them have their own character and can be used in different applications.
目前的多播密钥管理方案主要包括集中式、分布式和分层分组式，它们各有优缺点，适用于不同的情况。
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