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Server-aided anonymous attribute-based authentication in cloud computing

机译：云计算中服务器辅助基于匿名属性的身份验证

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摘要

The notion of attribute-based signature is one of the important security primitives to realize anonymous authentication. In an attribute based signature (ABS), users can generate a signature on a message with their attributes. With this signature, any verifier will be convinced that such a signature is generated from a signer with these attributes. However, the identity of the signers will be hidden from the verifier. ABS are useful to design anonymous authentication and attribute-based messaging system. However, existing work of attribute-based authentication usually requires huge computation during signing, which grows linearly with the size of the attributes. Thus, these methods result in heavy computation overhead on the users and are not suitable for devices with only small computation ability. Cloud computing is an emerging computing paradigm in which resources of the computing infrastructure are provided as outsourcing services over the Internet. In this paper, we first address the challenging issue of securely outsourcing ABS, which enables users to largely eliminate the computational costs of ABS generation. The security model is formally defined to protect the privacy of users' signing key while outsourcing the computation of signing. An efficient and secure outsourcing algorithm of ABS is also proposed. Extensive analysis shows that our scheme is secure in the proposed model and saves more than 90% computation overhead on the user side.
机译：基于属性的签名概念是实现匿名身份验证的重要安全原语之一。在基于属性的签名（ABS）中，用户可以使用其属性在邮件上生成签名。使用此签名，任何验证者都将确信，这种签名是从具有这些属性的签名者生成的。但是，签名者的身份将对验证者隐藏。 ABS对于设计匿名身份验证和基于属性的消息传递系统很有用。但是，现有的基于属性的身份验证工作通常需要在签名期间进行大量计算，并且随着属性的大小呈线性增长。因此，这些方法导致用户的大量计算开销，并且不适用于仅具有小的计算能力的设备。云计算是一种新兴的计算范例，其中计算基础结构的资源作为外包服务通过Internet提供。在本文中，我们首先解决安全外包ABS的挑战性问题，这使用户可以在很大程度上消除ABS生成的计算成本。正式定义了安全模型，以在外包签名计算时保护用户签名密钥的私密性。提出了一种安全高效的ABS外包算法。大量分析表明，该方案在所提出的模型中是安全的，并且在用户侧节省了90％以上的计算开销。

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