Certificateless aggregate signature scheme secure against fully chosen-key attacks

Certificateless aggregate signature scheme secure against fully chosen-key attacks
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无证书聚合签名方案可抵御完全选择密钥的攻击

DOI:
10.1016/j.ins.2019.11.037
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发表时间:
2020-04
影响因子:
8.1
通讯作者:
Willy Susilo
Willy Susilo
中科院分区:
计算机科学1区
文献类型:
--
作者:
Ge Wu;Futai Zhang;Limin Shen;Fuchun Guo;Willy Susilo

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无证书聚合签名(Clas)方案兼具无证书加密和聚合签名的优点。具体地说,它不仅简化了证书管理,没有引入密钥托管问题,而且将多个签名转化为一个聚合签名,从而节省了通信和计算成本。CLAS是一种功能强大的加密工具,但在实现之前,应该对其安全性进行彻底的分析。在这篇文章中,我们对类方案的安全性提出了新的见解。我们引入了一种在传统安全模型中没有考虑的潜在的和现实的攻击,称为全选择密钥攻击,并定义了针对完全选择密钥攻击的安全模型。与传统模型不同的是,该模型允许攻击者持有所有签名者的私钥,其目标不是伪造一个聚合签名,而是输出可以聚合成有效聚合签名的无效单个签名。我们发现在传统的安全模型中没有一个安全的类方案可以抵抗全选择密钥攻击,然后证明了如何加强现有方案的安全性来抵御这种攻击。
Certificateless aggregate signature (CLAS) schemes enjoy the benefits of both certificate less cryptography and aggregate signature features. Specifically, it not only simplifies the certificate management without introducing the key escrow problem but also transforms many signatures into one aggregate signature to save communication and computation cost. CLAS is a powerful cryptographic tool, yet its security should be thoroughly analyzed before being implemented. In this paper, we give a new insight into the security of CLAS schemes. We introduce a potential and realistic attack called fully chosen-key attacks that has not been considered in the traditional security models and define the security model against fully chosen-key attacks. In contrast to the traditional models, the adversary is allowed to hold all the signers' private keys and its goal is not to forge an aggregate signature but to output invalid single signatures that can be aggregated into a valid aggregate signature. We find there is no CLAS scheme secure in traditional security models that is secure against fully chosen-key attacks and then demonstrate how to reinforce the security of, an existing scheme to withstand such an attack.
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