<P>A multicast content service, including numerous devices, requires an efficient group key management scheme as one of its core components. The purpose of group key management is to provide a secure key-sharing scheme among the members of a gro...
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https://www.riss.kr/link?id=A107589788
2010
-
SCOPUS,SCIE
학술저널
862-870(9쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>A multicast content service, including numerous devices, requires an efficient group key management scheme as one of its core components. The purpose of group key management is to provide a secure key-sharing scheme among the members of a gro...
<P>A multicast content service, including numerous devices, requires an efficient group key management scheme as one of its core components. The purpose of group key management is to provide a secure key-sharing scheme among the members of a group so that messages transmitted via broadcasting or multicasting are not exposed to non-members. The Chinese Remaindering Group Key (CRGK) is an efficient group key management scheme based on the Chinese Remainder Theorem (CRT). It optimizes the number of re-key messages, the user-side key computation cost, and the number of stored keys. However, CRGK is not fit for a group with a large number of members because of the high computation complexity of the CRT. In this paper, we propose a Hierarchical CRGK (HCRGK) scheme that supports a group with a large number of members. We improved CRGK by adopting it to include an <I>n</I>-ary tree structure. The tree approach simplifies the group key management by distributing the group key computation to subgroups. Our scheme requires at most (log<I><SUB>m</SUB>N</I> + 1) re-key messages for a group with <I>N</I> members and a short computation time even when the group is very large.</P>
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