量子签名若干关键问题研究

项目名称： 量子签名若干关键问题研究

项目编号： No.61202398

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 计算机科学学科

项目作者： 李琴

作者单位： 湘潭大学

项目金额： 23万元

中文摘要： 本项目主要从事量子签名（QS）的基础研究，着重解决以下四个问题：1）分析仲裁QS方案的安全性并提出改进方法。目前多个研究团队指出以往的方案存在安全攻击，因此针对这些安全问题综合考虑和分析仲裁QS方案的安全性，并给出防范措施。2）设计高效的仲裁QS方案。已有方案中签名方和接收方与仲裁方共享的密钥仅能被使用一次，而将设计的方案中签名方和接收方可与仲裁方共享和使用长期密钥，从而效率可以显著提高。3）将安全高效的仲裁QS应用于在线量子支付系统中。在线支付系统通常用于大额支付，从而需要更高强度的安全性。安全高效的仲裁QS的应用可使得在线量子支付系统在保证安全的前提下更加简单实用。4）讨论真实QS的存在性。关于量子消息的真实QS曾被证明不可行，而最近可对量子消息进行签名的真实QS方案又被提出来，因此急需解决这两者之间的矛盾，并刻画真实QS的若干特征。这些问题的解决对于丰富和完善QS的研究具有重要意义。

中文关键词： 量子签名；量子密钥协商；量子盲计算；变色龙签名；陷门承诺

英文摘要： Four key problems of quantum signature (QS) will be investigated in this project. Firstly, several typical arbitrated QS schemes were recently cryptanalyzed by some research groups. In order to improve the security level of arbitrated QS schemes, we will give comprehensive consideration and analysis on them and derive some basic security requirements and effective countermeasures. Secondly, we will explore an efficient arbitrated QS scheme in which the signatory and the receiver will share a long-term secret key with the arbitrator. The newly introduced approach will solve the long lasting problem in all the existing arbitrated QS schemes that the key shared between the signatory and the arbitrator, or between the receiver and the arbitrator, could be used only once. Thirdly, on-line payment systems are generally used for large-value payment transactions and require higher security. So we will apply efficient and secure arbitrated QS to quantum on-line payment systems which can ensure the security and make them easy to use. Finally, we would examine the contradictory results on the impossibility of true QS and a true QS scheme proposed recently. We would attempt to make a clearer explanation regarding this issue that ensures the further development of true QS. Settlement of these four issues is of great signific

英文关键词： Quantum signature；Quantum key agreement；Quantum blind computation；Chameleon signature；Trapdoor commitment