簽密是密碼學(xué)中的新技術(shù)，能夠在一個邏輯步驟內(nèi)實現(xiàn)簽名和加密兩項功能，而且其代價要遠(yuǎn)遠(yuǎn)小于“先簽名后加密”，在電子現(xiàn)金支付系統(tǒng)（Electronic Funds Transfer
簡稱EFT）、電子拍賣、電子投票等領(lǐng)域有著廣泛的應(yīng)用前景。本文首先借助GOST 數(shù)字簽名體制[5]，結(jié)合Zheng[1]的簽密思想構(gòu)造出一種可公開驗證的簽密方案；最后結(jié)合shamir（t，n）門限方案構(gòu)造了具有指定接收組的可公開驗證的簽密方案，使得該方案除了具有保密性，認(rèn)證性與完整性外，還具有門限方案的優(yōu)點，與現(xiàn)有的門限共享驗證方案相比具有數(shù)據(jù)傳輸安全，通信代價更小，效率更高等特點。
關(guān)鍵詞：數(shù)字簽名；公開驗證；簽密；門限生成
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