J4 ›› 2012, Vol. 39 ›› Issue (4): 57-61+119.doi: 10.3969/j.issn.1001-2400.2012.04.011

• 研究论文 • 上一篇    下一篇

标准模型下的格基数字签名方案

王凤和1.2;胡予濮1;贾艳艳1   

  1. (1. 西安电子科技大学 计算机网络与信息安全教育部重点实验室,陕西 西安  710071;
    2. 山东建筑大学 理学院,山东 济南  250101)
  • 收稿日期:2011-05-09 出版日期:2012-08-20 发布日期:2012-10-08
  • 作者简介:王凤和(1979-),男,西安电子科技大学博士研究生,E-mail: fenghe2166@163.com.
  • 基金资助:

    国家自然科学基金资助项目(60970119,61173151,61173152);国家973资助项目(2007CB311201)

Lattice-based signature scheme in the standard model

WANG Fenghe1.2;HU Yupu1JIA Yanyan1   

  1. (1. Key Lab. of Computer Networks and Information Security of Ministry of Education, Xidian Univ., Xi'an  710071, China;
    2. Dept. of Mathematics and Physics, Shandong Jianzhu Univ., Jinan  250101, China)
  • Received:2011-05-09 Online:2012-08-20 Published:2012-10-08

摘要:

为了改进盆景树(Bonsai trees)格基签名方案的实现效率,提出了一个新的格基数字签名方案.在标准模型下,该方案的存在性不可伪造性是基于格上小整数解问题(SIS)的困难性.作为Bonsai trees签名的一个改进方案,改进方案的公钥长度由Bonsai trees签名的(2k+1)mn log q比特缩减为(k+1)mn log q比特,同时消息的签名长度也由原Bonsai trees签名的(k+1)m log q比特缩减到(1+k/2)m log q比特,能更好地实现签名方案的效率.

关键词: 数字签名, 格, 盆景树, 最小整数解问题, 标准模型

Abstract:

To improve the efficiency of the Bonsai trees signature which was proposed in Eurocrypt'10, utilizing the Bonsai trees algorithm, a new lattice-based signature scheme is proposed. Based on the hardness of the short integer solution problem (SIS), the proposed scheme is provably existentially unforgeable under a static chosen-massage attack in the standard model. Moreover, the public-key length of our proposed signature is (k+1)mn log q bit while the bonsai trees signature's is (2k+1)mn log q bit; the signature length of message is (1+k/2)m log q bit while the Bonsai trees signature scheme's is (k+1)m log q bit. So the proposed signature scheme is more efficient than the Bonsai trees signature.

Key words: digital signature, lattice, bonsai trees, short integer solution problem, the standard model

中图分类号: 

  • TP309