一个前向和后向安全的数字签名方案

一个前向和后向安全的数字签名方案 A Forward Secure and Backward Secure Digital Signature Scheme 李成 LI Cheng 1 first-author 何明星 HE Mingxing 1 西华大学数学与计算机学院 西华大学数学与计算机学院 School of Mathematics and Computer Engineering,Xihua University School of Mathematics and Computer Engineering,Xihua University 针对前向安全密码体制中某一时段私钥泄露会导致此时段后私钥的泄露这一问题,提出了一种同时具有前向和后向安全性的数字签名方案.在该方案中密钥由两部分的乘积组成,一部分在密钥演化中保证前向的安全,而另一部分在密钥演化中保证后向的安全,使得在当前密钥泄露的情况下,不仅以前时段的密钥不可计算,而且以后时段的密钥也是不可计算的.与已有的前向安全和容侵的数字签名方案相比,本文提出的方案不仅具有密钥容侵的优点,而且不需要多方参与. This paper proposes a new scheme of digital signature with forward security and backward security at the same time.The main idea of this paper is that the secret key is expressed by the product of two parts,one part ensuring forward security and the other ensuring backward security,thus makes the previous key and the forthcoming key incomputable even when the present key is compromised.Other than the property of intrusion-resilience,the proposed scheme does not need other parties in key-evolving,compared to the existing schemes of forward security and intrusion-resilient signature. 数字签名 密钥容侵 前向安全 后向安全 密钥演化 digital signature intrusion resilient forward secure backward secure key evolving TN918.1 国家自然科学基金（60773035）;教育部科学技术重点项目（205136）;四川省科技厅重点项目（05JY029-131） 2008-05-01 2021-04-01 5