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Anonymous HIBE: Compact Construction Over Prime-Order Groups

机译:匿名HIBE:素数订单组的紧凑构造

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摘要

We present an anonymous hierarchical identity based encryption (HIBE) scheme that not only achieves constant-size ciphertext, but also works in bilinear groups with prime order. In contrast to our work, all previous anonymous HIBE schemes either have ciphertext size linear in the depth of the hierarchy or work in bilinear groups with a composite order. Our construction is more efficient than previous schemes in terms of ciphertext size and decryption cost. We give provable security of our construction, consisting of confidentiality and anonymity, without random oracles. To gain anonymity, we introduce a novel and simple method called “double exponent” technique, which gives an anonymous HIBE scheme more compact than the result at CRYPTO 2006. Our method is quite general in that it works on both symmetric and asymmetric bilinear maps. The simple method might also be of independent interest to gain anonymity of attributes in constructing searchable encryption schemes on encrypted data.
机译:我们提出了一种基于匿名分层身份的加密(HIBE)方案,该方案不仅可以实现恒定大小的密文,而且可以在具有素数顺序的双线性组中工作。与我们的工作相反,所有以前的匿名HIBE方案要么具有在层次结构深度上呈线性的密文大小,要么以具有复合顺序的双线性组工作。在密文大小和解密成本方面,我们的结构比以前的方案更有效。我们提供了可证明的结构安全性,包括机密性和匿名性,没有随机预言。为了获得匿名性,我们引入了一种新颖且简单的方法,即“双指数”技术,该方法使匿名HIBE方案比CRYPTO 2006的结果更为紧凑。我们的方法非常通用,因为它可用于对称和非对称双线性图。对于在加密数据上构造可搜索的加密方案时,获取属性的匿名性,该简单方法也可能具有独立的兴趣。

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