计算机工程

• 安全技术 • 上一篇    下一篇

可证明安全的单向可变门限代理重签名方案

徐海峰,洪璇   

  1. (上海师范大学信息与机电工程学院,上海 200234)
  • 收稿日期:2015-03-25 出版日期:2016-04-15 发布日期:2016-04-15
  • 作者简介:徐海峰(1989-),男,硕士研究生,主研方向为信息安全;洪璇,副教授。
  • 基金项目:
    上海市自然科学基金资助项目(14ZR1431000)。

Unidirectional Variable Threshold Proxy Re-signature Scheme with Provable Security

XU Haifeng,HONG Xuan   

  1. (College of Information,Mechanical and Electrical Engineering,Shanghai Normal University,Shanghai 200234,China)
  • Received:2015-03-25 Online:2016-04-15 Published:2016-04-15

摘要: 现有门限代理重签名方案的门限值基本是固定的,但实际应用中需要根据消息的重要程度灵活地变化门限值。为此,基于Suni门限代理重签名方案,提出一种单向可变门限代理重签名方案。在每次进行重签名前,系统会动态设定门限值,每个代理将最初接收的部分子密钥进行重新计算,得到最新门限值下的重签名密钥及其对应的验证公钥,且系统只需提供受托者的公钥信息,避免了受托者承担安全风险。与现有单向可变重签名方案相比,该方案计算效率和安全性更高,签名长度更短。

关键词: 数字签名, 可变门限, 重签名密钥, 门限代理重签名, 单向性

Abstract: In most existing threshold proxy re-signature schemes,threshold value is essentially immutable.However,depending on the significance of re-signature message,the value should be changed dynamically in many practical applications.Based on proxy re-signature scheme Suni,this paper designs a new threshold proxy re-signature scheme which is unidirectional and variable.The system sets the new value of threshold before each re-signature,each agent re-calculates originally received sub-key partially,then each proxy can generate corresponding re-signature sub-key and verification key non-interactively.In order to protect the trustee security and avoid risk,system provides the public key when generating re- signature key.Compared with other unidirectional and variable re-signature schemes,this scheme can provide better efficiency in computation cost and signature length,and it has high security.

Key words: digital signature, variable threshold, re-signature key, threshold proxy re-signature, unidirectionality

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