【摘要】 给出了一个无需求模逆的椭圆曲线签名算法;利用该算法构造了一个远程用户认证协议——NECSA协议,其安全性基于单向Hash函数和椭圆曲线离散对数计算的困难性。该协议具有以下特点:允许用户自主选择并更改口令,实现了双向认证;能够抵御中间人攻击,抗DOS攻击;具备前向安全性、强安全修复性和"黑名单"拒绝服务机制,是一个低开销的、安全的远程用户认证协议。更多还原

【Abstract】 A no-inverse elliptic curve digital signature scheme is presented in this paper.A novel remote user authentication protocol-GECSA,which is based on the no-inverse elliptic curve signature and has no inverse operation,is also proposed.The security of the protocol relies on Hash function and the discrete logarithm problem over the points on the elliptic curve,the protocol has many merits:it let users freely choose and change password at their own will;it provides mutual authentication between two entities;in addition,it has lower computational costs, it resists man-in-middle attack and denial of service attack;it has forward security and strong security reparability. Furthermore,it has black list eviction mechanism.Overall,the proposed protocol is a better protocol with lower cost and strong security.更多还原