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A Novel Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption with Anonymous Key Generation

机译:一种新的隐私保留分散的分散密文 - 策略基于基于密钥的加密,具有匿名密钥生成

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A privacy-preserving decentralized ciphertext-policy attribute-based encryption (CP-ABE) scheme is a variant of the multi-authority attribute-based encryption schemes where it requires neither a central authority nor cooperation among authorities for issuing secret keys. It also featured the privacy-preserving and resisting user collusion. However, previous privacy-preserving decentralized CP-ABE schemes can only hide user's partial information, such as global identifier (GID), but user's attribute information leaked to the authority may be sensitive which will lead to privacy disclosure. To overcome this shortcoming, we propose an improved privacy-preserving decentralized CP-ABE scheme with anonymous key generation protocol, where it can prevent authorities from learning any information about user's both GID and attributes. Theoretical analysis and simulation results demonstrate that the proposed scheme is secure and efficient. In the standard model, its security is reduced to a standard decisional bilinear Diffie-Hellman complexity assumption.
机译:保留了一种基于隐私的分散的密文 - 策略属性的加密(CP-ABE)方案是基于多权限属性的加密方案的变体,其中它既不需要一个中央权限或当局之间的合作,以发出秘密密钥。它还具有隐私保留和抵制用户勾结的功能。然而,以前的隐私保留分散的CP-ABE方案只能隐藏用户的部分信息,例如全局标识符(GID),但是泄露给权限的用户的属性信息可能是敏感的,这将导致隐私披露。为了克服这种缺点,我们提出了一种具有匿名关键生成协议的改进的隐私保留分散的CP-ABE方案,可以防止当局学习有关用户的GID和属性的任何信息。理论分析和仿真结果表明,所提出的方案是安全和有效的。在标准模型中,其安全性降低到标准判决双线性差异Hellman复杂性假设。

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