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签密是密码学中的新技术,能够在一个逻辑步骤内实现签名和加密两项功能,而且其代价要远远小于“先签名后加密”,在电子现金支付系统(ElectronicFundsTransfer简称EFT)、电子拍卖、电子投票等领域有着广泛的应用前景。本文首先借助GOST数字签名体制,结合Zheng的签密思想构造出一种可公开验证的签密方案;最后结合shamir(t,n)门限方案构造了具有指定接收组的可公开验证的签密方案,使得该方案除了具有保密性,认证性与完整性外,还具有门限方案的优点,与现有的门限共享验证方案相比具有数据传输安全,通信代价更小,效率更高等特点。
Signcryption is a new technology in cryptography. It can implement two functions of signature and encryption in a logical step, and its cost is far less than “Signature and then encrypt”. In electronic payment system (ElectronicFundsTransfer referred to as EFT), electronic Auction, electronic voting and other fields have a wide range of applications. In this paper, a publicly verifiable signcryption scheme is constructed by means of GOST digital signature scheme combined with Zheng’s signcryption. Finally, a publicly verifiable signcryption scheme with designated receiving group is constructed based on the shamir (t, n) threshold scheme , This scheme not only has the confidentiality, authentication and integrity, but also has the advantages of threshold scheme. Compared with the existing threshold shared verification scheme, it has the advantages of data transmission security, lower communication cost and higher efficiency.