本文選題：代理簽名 + 前向安全　； 參考：《昆明理工大學(xué)》2014年碩士論文

【摘要】：隨著計(jì)算機(jī)技術(shù)和通信技術(shù)的飛速發(fā)展,人們已經(jīng)逐漸步入了一個(gè)嶄新的互聯(lián)網(wǎng)時(shí)代。網(wǎng)上銀行、電子政務(wù)、云計(jì)算、大數(shù)據(jù)等網(wǎng)絡(luò)時(shí)代的產(chǎn)物正蓬勃發(fā)展。然而,在信息化革命不斷推進(jìn)的同時(shí),網(wǎng)絡(luò)安全隱患也越來(lái)越突出。那么,如何建立全面而有效的防護(hù)措施,如何開發(fā)出更加適應(yīng)信息時(shí)代需求的數(shù)據(jù)安全模式是人們關(guān)心的焦點(diǎn)。數(shù)字簽名作為密碼學(xué)中的關(guān)鍵技術(shù),在數(shù)據(jù)完整性、不可否認(rèn)性、身份認(rèn)證以及匿名性上等方面起著重要的作用,為網(wǎng)絡(luò)通信提供了很好的安全機(jī)制。 1996年,代理簽名體制首次被Manbo、Usuda和Okamoto提出。代理簽名是一種具有授權(quán)機(jī)制的數(shù)字簽名。在代理簽名體制中,由于某種原因不能參加實(shí)際簽名的原始人可以將他的數(shù)字簽名權(quán)委托給代理人,讓代理人代替原始簽名人簽署消息。代理簽名已經(jīng)被廣泛運(yùn)用于移動(dòng)通信、電子商務(wù)、電子投票等方面。迄今為止,許多代理簽名方案被相繼提出,但一些已提出的方案仍然存在安全問(wèn)題,因此,深入研究代理數(shù)字簽名的關(guān)鍵理論和技術(shù)是有著非常重要的理論意義和應(yīng)用價(jià)值。 本文主要研究了三種具有特殊性質(zhì)的代理簽名,從擴(kuò)展代理簽名安全性的角度提出自己的研究成果： 1.首先,對(duì)已有的可共享驗(yàn)證的(t,n)門限多代理多重簽名方案進(jìn)行了回顧。指出TYH方案不能抵抗偽造攻擊和不真正具有可共享驗(yàn)證性,同時(shí),也對(duì)WLD方案進(jìn)行了安全性分析,指出他們的方案不具有私鑰安全性。針對(duì)已有方案的安全缺陷,提出了一種新的可共享驗(yàn)證的門限多代理多重簽名方案,并對(duì)方案的安全性進(jìn)行了論證,結(jié)果表明,新方案的安全性受到RSA難題的保證,并且滿足代理簽名的各種安全性要求。 2.分析了Wang方案的安全缺陷,指出Wang方案不滿足前向安全性質(zhì),針對(duì)數(shù)字簽名私鑰丟失后帶來(lái)的嚴(yán)重后果,將前向安全數(shù)字簽名體制和代理簽名體制相結(jié)合,提出一種具有前向安全特性的代理簽名,從而保證了私鑰丟之前產(chǎn)生的代理簽名是有效的。并論證了新方案的安全性。 3.分析了Tan的Schnorr型代理盲簽名方案,發(fā)現(xiàn)Tan方案的一些缺陷。針對(duì)Tan方案的缺陷,并且結(jié)合盲簽名的性質(zhì),提出一個(gè)改進(jìn)的代理盲簽名方案。改進(jìn)的方案能夠抵抗原始簽名人和簽名接收人的偽造攻擊,而且具有強(qiáng)盲性和撤銷代理權(quán)的特性。
[Abstract]:With the rapid development of computer technology and communication technology, people have entered a new Internet era. Online banking, e-government, cloud computing, big data and other products of the network era is booming. However, while the information revolution continues to advance, the hidden dangers of network security are becoming more and more prominent. Therefore, how to establish comprehensive and effective protection measures and how to develop a more suitable data security model to meet the needs of the information age is the focus of attention. As a key technology in cryptography, digital signature plays an important role in data integrity, non-repudiation, identity authentication and anonymity. It provides a good security mechanism for network communication. In 1996, the proxy signature system was first proposed by Manbo Usuda and Okamoto. Proxy signature is a digital signature with authorization mechanism. In the proxy signature system, the primitive person who can not participate in the actual signature for some reason can entrust his digital signature right to the agent and let the agent sign the message instead of the original signer. Proxy signature has been widely used in mobile communication, e-commerce, electronic voting and so on. So far, many proxy signature schemes have been proposed one after another, but some of the proposed schemes still have security problems. Therefore, it is very important to study the key theory and technology of proxy digital signature. In this paper, three kinds of proxy signatures with special properties are studied, and their research results are presented from the point of view of extending proxy signature security. 1. Firstly, the existing multi-proxy multi-signature schemes with shared verifiability are reviewed. It is pointed out that TYH schemes can not resist forgery attacks and can not be truly shared verifiably. At the same time, the security analysis of WLD schemes is carried out, and it is pointed out that their schemes do not have private key security. In view of the security defects of the existing schemes, a new threshold multi-agent multi-signature scheme is proposed, which can be shared and verified, and the security of the scheme is demonstrated. The results show that the security of the new scheme is guaranteed by the RSA problem. And meet the proxy signature security requirements. 2. This paper analyzes the security defects of Wang scheme, and points out that the Wang scheme does not satisfy the forward security property. In view of the serious consequences brought by the loss of the private key of digital signature, the forward secure digital signature scheme and the proxy signature scheme are combined. A proxy signature with forward security is proposed to ensure that the proxy signature generated before the loss of the private key is effective. The security of the new scheme is demonstrated. 3. The Schnorr proxy blind signature scheme of Tan is analyzed, and some defects of Tan scheme are found. Aiming at the defects of Tan scheme and combining the properties of blind signature, an improved proxy blind signature scheme is proposed. The improved scheme can resist the forgery attack of the original signer and the signature receiver, and has the characteristics of strong blindness and revocation of the proxy.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TP393.08

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