一种安全灵活的多方签名加密体制

A Study of Secure and Flexible Multi-signcryption Scheme

多方签名加密体制是对签名加密体制的扩展,即多个签名者共同对消息进行签名加密操作。文章首先分析了现有的多方签名加密体制存在的缺陷,然后讨论了一种新的多方签名加密体制。该体制不仅能够有效实现消息机密性、消息不可伪造性、不可否认性及强健性等安全服务,而且可以实现消息灵活性、次序灵活性、消息可验性以及次序可验性。因此,该体制适用于保护消息及多个签名者免遭恶意攻击。

Multi-signcryption scheme is an extension of signcryption scheme. Namely, the multiple signers can perform together the signcryption operation on messages. In this paper, we firstly analyze the weaknesses of the existing multisigcryption schemes. Then, we propose a new multi-sigcryption scheme. The proposed scheme not only efficiently implements message confidentiality, message unforgeability, non-repudiation and robustness, hut also provides message flexibility, order flexibility, message verifiability and order verifiability. Therefore, it＇s suitable for protecting the messages and the multiple signers from malicious attacks.