针对一个多接收者基于身份签密方案，从签密方案的安全属性入手，分析其安全性。
Aiming at an identity-based signcryption scheme for multi-receiver beginning with the security attribute, this paper studies the security property of this scheme.
给出了三种攻击并指出于刚等人提出的前向安全的基于身份的代理签密方案是不安全的。
Three attacks on Yu Gang et al's scheme to show that their forward secure proxy-signcryption scheme based on identity is insecure.
基于身份和椭圆曲线上双线性对，提出了一种新的多重签密方案。
Based on identity and bilinear pairing on the Elliptic Curve, a new multi-signcryption scheme is proposed.
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