GOST门限签密方案

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 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 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