Abstract: Based on Abdalla-Reyzin’s forward-secure signature scheme，a strong forward secure signature scheme is proposed by introducing the mechanism of one-way hash chain into the digital signature of the scheme.Even if the malicious attacker can intrude the system at period i，it can not forge any signatures in the past and future periods.The security of our scheme relies on difficulty of solving square root problem on Z^*_N and one-way property of hash functions.

Key words: forward security, strong forward security, digital signature, one-way hash chain

摘要： 在Abdalla-Reyzin的前向安全签名方案的基础上，通过引入单向散列链机制，提出了一个强前向安全的数字签名方案，攻击者即使在第i时段入侵系统，也无法伪造以前或以后时段的签名，方案的安全性基于在Z^*_N上计算平方根的困难性和散列函数的单向性。

关键词: 前向安全, 强前向安全, 数字签名, 单向散列链