Abstract: Aiming at an identity-based signcryption scheme for multi-receiver beginning with the security attribute, this paper studies the security property of this scheme. It is proved that this scheme is neither semantically secure nor unforgeable with two successful attacks. There effective algorithms for forgery of any message or identity. An improved identity-based signcryption scheme for multi-receiver is proposed with security proof.

Key words: identity-based signcryption, multi-receiver, semantic security, unforgeability

摘要： 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。通过2个成功的攻击证明该方案不满足语义安全性和不可伪造性要求，存在对任何消息和任何身份伪造密文的有效算法。提出一个改进的多接收者基于身份签密方案并给出安全性 证明。

关键词: 基于身份签密, 多接收者, 语义安全, 不可伪造性

CLC Number: 

• TP309.2