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학술대회 Hierarchical CRGK for a Large-scale User Group
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박지현, 윤기송, 류재철
International Conference on Consumer Electronics (ICCE) 2009, pp.1-2
08MS1900, 사용자 중심의 콘텐츠 보호 유통 기술 개발, 서영호
The purpose of the group key management is to provide a secure key sharing scheme among the users in a group on a broadcast or a multicast environment. CRGK[1] is the centralized group key management scheme based on the Chinese Remainder Theorem(CRT). It optimizes the number of rekey message, user-side key computation, and number of key storage. However, CRGK is suited for a small size user group because of the computation complexity of the Chinese remainder theorem. In this paper, we propose a hierarchical CRGK scheme which is able to support a large-scale user group. Our approach is to adopt an n-ary tree with the CRGK. Our scheme requires the small number of re-key messages and the short computation timeeven though the size of a user group increases largely. ©2009 IEEE.
KSP 제안 키워드
Chinese remainder theorem(CRT), Group key management scheme, Key storage, User groups, computation complexity, key sharing, large-scale, n-ary tree, small size