基于椭圆曲线密码体制的一种具有前向安全的数字签名方案

A Forward-secure Digital Signature Scheme of ECC (Elliptic Curve Cryptography) Cryptography

为了解决普通数字签名密钥被泄漏的局限性,作者提出一种椭圆曲线数字签名方案,并基于前向安全理论提出一种具有前向安全的数字签名方案.新方案中用于数字签名的私钥由一个单向函数控制并随时间的推移按时间段不同不断地改变,而其相对应的公钥却保持不变,因此即使在某一时间段签名密钥被泄漏,攻击者依然无法仿造先前时间段的签名,从而保证了以前时间段签名的安全性.文中还分析了新方案的安全性,并证明了方案的有效性.

In order to overcome the limitations of the ordinary digital signatures,this paper advances an ECC digital signature scheme,and then puts forward a new forward-secure digital signature scheme,which is based on the elliptic curve cryptosystem. In the new scheme,the digital signature’s private key is under the control of some one-way function and continually changed in different durations with time going by,but its public key remains the same.So the attacker still could not fake the signature of the past time even if the private key in signature is leaked out in some period of time.In this way this scheme makes sure of the security of signature of former phases.It analyzes the security of the scheme and proves the scheme’s validity.