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(Electronic Funds Transfer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[5],结合Zheng[1]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。关键词:数字签名;公开验证;签密;门限生成Abstract :Signcryption is a new cryptographic primitive which simultaneously fulfillsboth the functions of digital signature and encryption in a logically single step, and with a cost significantly lower than that required by “signature then encryption”.In this paper, first we constructs a new signcryption scheme , which is based on GOST’s digital signature scheme . Then we use threshold scheme to construct a (t,n) threshold shared verification signcryption scheme , Compared with previous threshold shared verification signature encryption scheme , it has more secrecy of data transmission , requires smaller communication cost , performs efficiently and decides exactly which verifier tampers secret share etc .Key words : digital signature , Public verification, signcryption ,Threshold generation
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