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群签密是一种能够同时提供群签名和群加密的密码体制。本文首次将群签密的应用范围推广到仅需要完整性的场合,提出了广义群签密的定义。广义群签密既有群签密的属性,对特定的输入还可以单独提供群签名的功能。基于 ACJT 群签名方案,本文提出一个新的群签密方案 SC-ACJT。同时,在有特定的发送方和接收方时,方案执行群签密功能;在没有特定的接收方时,方案等价于 ACJT 群签名。
Group signing is a password system that provides both group signatures and group encryption. This paper, for the first time, extends the application scope of group signcryption to the situation that only integrity is required. The definition of generalized group signcryption is proposed. Generalized group signatures have the properties of both existing group signatures and group signatures separately for specific inputs. Based on the ACJT group signature scheme, this paper proposes a new group signcryption scheme SC-ACJT. In the meantime, when there is a specific sender and receiver, the scheme performs group signature function. In the absence of a specific receiver, the scheme is equivalent to the ACJT group signature.