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arXiv 1303.4262cs.CR
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密钥分配方案在认证协议中的应用

On the Use of Key Assignment Schemes in Authentication Protocols

James Alderman, Jason Crampton

摘要:

密钥分配方案(KAS)已在加密强制访问控制的背景下得到广泛研究,其中派生密钥用于解密受保护的资源。在本文中,我们将探讨KAS在实体认证协议中的使用,其中我们使用派生密钥来加密挑战。通过将实体与表示特定服务的安全标签相关联,KAS的这种新颖使用允许根据认证策略对实体进行有效认证。加密密钥与每个安全标签相关联,并且证明对适当密钥的了解用作身份验证的基础。因此,通过控制这样的密钥的分发,可以有效地对实体可以被认证的环境以及它们可以获得访问的服务进行限制。在这项工作中,我们将探讨如何开发标准化的协议和新颖的结构,以验证实体作为与特定安全标签相关联的组的成员,同时保护系统中的长期秘密。我们还看到,这样的结构可以允许认证,同时保持匿名性,并且通过包括可信的第三方,我们可以实现个人身份的认证和基于时间戳的认证,而不需要同步时钟。

英文摘要:

Key Assignment Schemes (KASs) have been extensively studied in the context of cryptographically-enforced access control, where derived keys are used to decrypt protected resources. In this paper, we explore the use of KASs in entity authentication protocols, where we use derived keys to encrypt challenges. This novel use of KASs permits the efficient authentication of an entity in accordance with an authentication policy by associating entities with security labels representing specific services. Cryptographic keys are associated with each security label and demonstrating knowledge of an appropriate key is used as the basis for authentication. Thus, by controlling the distribution of such keys, restrictions may be efficiently placed upon the circumstances under which an entity may be authenticated and the services to which they may gain access. In this work, we explore how both standardized protocols and novel constructions may be developed to authenticate entities as members of a group associated to a particular security label, whilst protecting the long-term secrets in the system. We also see that such constructions may allow for authentication whilst preserving anonymity, and that by including a trusted third party we can achieve the authentication of individual identities and authentication based on timestamps without the need for synchronized clocks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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