基于无证书的格基代理签密方案

Certificateless Proxy Signcryption Scheme from Lattice

无证书代理签密在信息安全领域发挥着越来越重要的作用。现有的大多数无证书代理签密基于传统数学理论,无法抵制量子计算攻击。该文采用格密码技术提出基于无证书的格基代理签密(L-CLPSC)方案。L-CLPSC在带错误学习(LWE)问题和小整数解(SIS)问题的困难假设下满足自适应选择密文攻击下的不可区分性和自适应选择消息攻击下的不可伪造性。相比较而言,L-CLPSC具有更高的计算效率和更低的通信代价。

Certificateless proxy signcryption plays an increasingly significant role in information security fields.Most of certificateless proxy signcryption schemes are based on traditional mathematic theory and can not resist the quantum computing attacks.In this paper,a new CertificateLess Proxy SignCryption from Lattice(L-CLPSC)is proposed by using lattice-based cryptography technology.L-CLPSC is indistinguishable against adaptive chosen-ciphertext attacks and unforgeable against adaptive chosen-message attacks under Learning With Errors(LWE)and Small Integer Solution(SIS)assumptions.Comparison shows L-CLPSC has higher computation efficiency and lower communication overhead.