【作者】 林婷婷；

【导师】 王晓峰；

【作者基本信息】 西安理工大学 ， 应用数学， 2007， 硕士

【摘要】 数字签名是电子信息时代的特殊产物,是保证电子数据真实性、完整性、不可否认性的有效手段,而其中控制验证权的数字签名在保护签名者的一些秘密信息方面具有特殊的应用,从而大大增加了在开放网络环境下信息交互的公平性。本文重点研究了指定验证者签名、限制验证者签名和条件可验证签名等控制验证权的数字签名,主要工作如下:总结了控制验证权的数字签名的发展及研究现状,重点对指定验证者签名、限制验证者签名和条件可验证签名的应用背景和一些典型方案进行了分析和评价,指出了优点和不足。提出了一个新的称之为限制多方验证者签名的方案。在该方案中,签名者只需使用一个签名私钥、计算一次签名,就能达到同时限制n个验证者验证签名的目的,弥补了一般限制验证者签名方案只有一个限制验证者的局限。同时本方案增加了保证公平性的否认协议,达到了一般限制验证者签名和限制多方验证者签名所需的安全需求,与能够达到同样的目的的限制单方验证者签名相比,本方案具有比较高的效率。基于实际生活中的一些客观需求,提出了另一种新的称之为限制联合验证者签名的方案。新签名方案不仅将消息保密,而且仅仅允许签名者所限定的t个验证者合作,才能验证签名的有效性。该方案所生成的签名较短,并且签名的长度不随验证者的增加而增加。本方案在随机预言模型下达到了所需的安全需求。更多还原

【Abstract】 The digital signature is a special product of electronic information age. It is an effective method to guaranteeing the authenticity, integrity and non-repudiation of electronic information. There is a kind of special digital siganture, which provide special functionality to control the verification rights of the signatures, can be used to protect the secret informaion of signer and named as digital signatures with verification right control. This special digital signature can be used to insure the fairness of information interaction in the opening internet circumstance. Digital signatures with verification right control such as designated verifier signatures, limited verifier signatures and conditionally verifiable signatures are studied in this paper and the main works are as follows:The development of digital signatures with verification right control is described. Especially, the application background, advantages and flaws of some typical schemes such as designated verifier signatures, limited verifier signatures and conditionally verifiable signatures are presented.A new digital signature scheme is proposed, which is named as limited multi-verifier signatures. The new scheme provides the functionality that only one signature computation can limit multiple verifiers to verify the validity of the signature. Therefore, the limitation of only one limited verifier in generic limited verifier signatures schemes is offseted. The new scheme supports denial protocol and the desired security notions are achieved. Moreover, this scheme has higher efficiency than performing generic limited single verifier signatures multiple times.Based on some practice application requirments, another new digital signature scheme is proposed, which is named as limited confederate verifier signatures. The new scheme not only can hide the messege, but also allows that the signature can be verified iff all the designated verifiers cooperate. The siganture generated by this new scheme is short, and the size of the signature does not grow with the number of verifiers. Moreover, the scheme is proved toachieve the desired security request under the random oracle model.更多还原