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Secure Threshold Multi Authority Attribute Based Encryption without a Central Authority

机译：安全阈值多权限属性的基于Concryption，没有中央权限

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摘要

An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes,: and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted central authority which can decrypt every ciphertext in the system. This central authority would endanger the whole system if it's corrupted. This paper presents a threshold multi authority fuzzy identity based encryption(MA-FIBE) scheme without a central authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d{sub}k of the given attributes about the message for at least t + l, t ≤ (n/2) honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.
机译：基于属性的加密方案（ABE）是一个加密原语，其中每个用户由一组属性标识，：这些属性的某些功能用于确定解密每个密文的能力。 Chase提出了TCC 2007中的第一个多权力ABE计划，作为埃塞勒科州萨海和水域呈现的开放问题的答案，2005年。然而，她的计划需要一个完全可信赖的中央机关，可以解密系统中的每个密文。如果它损坏，这次中心权威将危及整个系统。本文首次介绍了基于阈值多权限模糊标识的基于基于加密（MA-FIBE）方案，而不是中央权威。加密器可以加密消息，使得用户只有在给定属性的至少关于至少t + l，t≤（n / 2）所有n的消息的至少d {sub} k，那么拟议计划中的属性当局。安全证明是基于潜在的联合随机秘密共享协议和联合零秘密共享协议的保密以及标准策略双线性差异Hellman假设。所提出的MA-FIBE可以扩展到基于阈值多权限属性的加密（MA-ABE）方案，并进一步扩展到主动MA-ABE方案。

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