發(fā)布時(shí)間：2018-11-03 19:45

【摘要】：通常情況下,數(shù)字簽名具有公開可驗(yàn)證性,即任何用戶都可以驗(yàn)證數(shù)字簽名的合法性。但有的時(shí)候,簽名的消息可能會(huì)涉及一些簽名者的隱私信息(例如:醫(yī)療隱私和購物信息),如果這些消息的簽名被公開驗(yàn)證,將會(huì)泄露了簽名者的隱私信息,從而對(duì)簽名者帶來不好的影響。指定驗(yàn)證者簽名很好地解決了這個(gè)問題,由于在指定驗(yàn)證者簽名中,簽名者(Alice)指定一個(gè)可信賴的驗(yàn)證者(Bob)去驗(yàn)證簽名的有效性,被指定的驗(yàn)證者(Bob)不能向任何第三方證明簽名的有效性,也不能讓第三方相信這個(gè)簽名是由Alice生成的,因?yàn)楸恢付ǖ尿?yàn)證者(Bob)也可以生成該消息的一個(gè)合法簽名。為了避免中間人截取簽名信息,強(qiáng)指定驗(yàn)證者簽名被提出來。它是指只有擁有指定驗(yàn)證者的私鑰才能驗(yàn)證簽名的正確性,并且被指定驗(yàn)證者也可模擬生成一個(gè)與原始簽名具有相同分布的簽名副本。強(qiáng)指定驗(yàn)證者簽名在保證簽名的認(rèn)證性的基礎(chǔ)上,還保護(hù)簽名者的隱私。因此,強(qiáng)指定驗(yàn)證者簽名在保護(hù)簽名者的隱私方面具有重要的作用。本文從簽名權(quán)的非授權(quán)性、異構(gòu)下的強(qiáng)指定驗(yàn)證者簽名、抵抗合謀攻擊的無證書指定驗(yàn)證者代理簽名三個(gè)方面進(jìn)行研究,并取得了如下三方面成果:1.針對(duì)Zhang J等人提出的非授權(quán)的強(qiáng)指定驗(yàn)證者簽名方案不滿足非授權(quán)性和健壯性等缺陷,提出了一個(gè)改進(jìn)的非授權(quán)的強(qiáng)指定驗(yàn)證者簽名方案。提出的方案滿足健壯性和非授權(quán)性。2.受異構(gòu)簽密思想的啟發(fā),提出了一個(gè)雙向的異構(gòu)下強(qiáng)指定驗(yàn)證者簽名方案,即基于公鑰基礎(chǔ)設(shè)施(PKI)和基于身份的公鑰密碼體制(IBC)兩套密碼系統(tǒng)之間的強(qiáng)指定驗(yàn)證者簽名方案。提出的方案滿足指定驗(yàn)證者的簽名方案的安全性要求,其中不包括非授權(quán)性。3.對(duì)劉曉紅等人提出的無證書代理簽名方案的安全性進(jìn)行了分析,發(fā)現(xiàn)其易遭受惡意KGC攻擊、原始簽名人和KGC的合謀攻擊,以及代理簽名人和KGC的合謀攻擊。提出了一個(gè)改進(jìn)無證書代理簽名方案,并結(jié)合強(qiáng)指定驗(yàn)證者簽名的思想,提出了一個(gè)無證書強(qiáng)指定驗(yàn)證者代理簽名方案。安全性分析表明,提出的方案能抵抗兩類敵手的攻擊與合謀攻擊,同時(shí)也滿足強(qiáng)指定驗(yàn)證者簽名的安全性要求。
[Abstract]:In general, digital signature is publicly verifiable, that is, any user can verify the validity of digital signature. However, sometimes the signed message may involve some signer's privacy information (e.g., medical privacy and shopping information), and if the signature of these messages is publicly verified, it will reveal the signer's privacy information. This will bring bad influence to the signer. Specifying the verifier signature solves this problem well, because in the designated verifier signature, the signer (Alice) specifies a trusted verifier (Bob) to verify the validity of the signature. The designated verifier (Bob) cannot prove the validity of the signature to any third party or convince the third party that the signature was generated by Alice because the designated verifier (Bob) can also generate a legal signature of the message. In order to prevent the middleman from intercepting signature information, the strongly designated verifier signature is proposed. It means that only the private key of the designated verifier can verify the correctness of the signature, and the designated verifier can also simulate the generation of a copy of the signature with the same distribution as the original signature. The strongly specified verifier signature also protects the signer's privacy on the basis of the authentication of the signature. Therefore, strongly specified verifier signature plays an important role in protecting the signer's privacy. In this paper, the non-authorization of signature right, the signature of strong designated verifier under heterogeneity, and the proxy signature of non-certificated designated verifier who resist collusion attack are studied. The results are as follows: 1. An improved strongly designated verifier signature scheme proposed by Zhang J et al is proposed to solve the problem that the unauthorized strongly designated verifier signature scheme does not satisfy the requirements of non-authorization and robustness. The proposed scheme meets the requirements of robustness and non-authorization. 2. Inspired by the idea of heterogeneous signcryption, a bidirectional strongly specified verifier signature scheme is proposed. That is, a strong designated verifier signature scheme between (PKI) and (IBC), which is based on public key infrastructure (PKI) and identity-based public key cryptosystem (IBC). The proposed scheme meets the security requirements of the designated verifier signature scheme, which does not include unauthorized. 3. 3. This paper analyzes the security of the certificateless proxy signature scheme proposed by Liu Xiaohong et al. It is found that the scheme is vulnerable to malicious KGC attacks, collusion attacks between original signers and KGC, and collusion attacks between proxy signers and KGC. In this paper, an improved proxy signature scheme without certificates is proposed. Combining with the idea of strongly designated verifier signature, a proxy signature scheme with no certificate is proposed. The security analysis shows that the proposed scheme can resist two kinds of enemy attacks and collusion attacks, and it also meets the security requirements of strongly designated verifier signatures.
【學(xué)位授予單位】：西華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN918.91

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