A improved scheme for authenticated group key exchange

Jian Shu, Chunxiang Xu
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Abstract

Authenticated group key exchange (AGKE) enable a set of participants in a public network to share a key which can be further used to achieve confidentiality and authentication. Most of the schemes required a linear number of communications round with respect to the number of group members, such schemes are not practical. Others are inefficient being required some additional condition such as central authority or logic structure. After analyzed the security of bresson's protocol, a improved scheme is proposed, which is simple and efficient. The scheme is proven secure under Decisional Diffie-Hellman assumption.
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一种改进的认证组密钥交换方案
经过身份验证的组密钥交换(AGKE)使公共网络中的一组参与者能够共享密钥,该密钥可进一步用于实现机密性和身份验证。大多数方案要求相对于组成员数量的通信轮数是线性的,这样的方案是不实际的。另一些则是效率低下的,因为需要一些额外的条件,如中央权威或逻辑结构。在分析了布列松协议安全性的基础上,提出了一种简单、高效的改进方案。在decision Diffie-Hellman假设下证明了该方案的安全性。
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