GOST门限签密方案

Threshold GOST Signcryption Scheme

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 cryptographic primitive which simultaneously fulfills both 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 signc/yption 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.