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Adaptively secure revocable hierarchical IBE from k-linear assumption

机译：从k-linear假设自适应安全的可撤销分层IBE

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Revocable identity-based encryption (RIBE) is an extension of IBE with an efficient key revocation mechanism. Revocable hierarchical IBE (RHIBE) is its further extension with key delegation functionality. Although there are various adaptively secure pairing-based RIBE schemes, all known hierarchical analogues only satisfy selective security. In addition, the currently known most efficient adaptively secure RIBE and selectively secure RHIBE schemes rely on non-standard assumptions, which are referred to as the augmented DDH assumption and q-type assumptions, respectively. In this paper, we propose a simple but effective design methodology for RHIBE schemes. We provide a generic design framework for RHIBE based on an HIBE scheme with a few properties. Fortunately, several state-of-the-art pairing-based HIBE schemes have the properties. In addition, our construction preserves the sizes of master public keys, ciphertexts, and decryption keys, as well as the complexity assumptions of the underlying HIBE scheme. Thus, we obtain the first RHIBE schemes with adaptive security under the standard k-linear assumption. We prove adaptive security by developing a new proof technique for RHIBE. Due to the compactness-preserving construction, the proposed R(H)IBE schemes have similar efficiencies to the most efficient existing schemes.
机译：可撤销基于身份的加密（RIBE）是IBE的扩展，具有有效的密钥撤销机制。 Revocable等级IBE（RHIBE）是其具有关键委派功能的进一步扩展。尽管存在各种自适应的基于配对的Ribe方案，但是所有已知的分层类似物只能满足选择性安全性。此外，目前已知最有效的自适应安全的Ribe以及选择性地保护Rhibe方案依赖于非标准假设，其分别被称为增强DDH假设和Q型假设。在本文中，我们提出了一种简单但有效的Rhibe方案的设计方法。我们为基于具有少数属性的HIBE方案为Rhibe提供通用设计框架。幸运的是，若干最先进的基于搭配的HIBE方案具有属性。此外，我们的施工保留了主公钥，密文和解密密钥的大小，以及底层占地方案的复杂性假设。因此，我们在标准K-Linear假设下获得具有自适应安全性的第一个Rhibe方案。通过开发Rhibe的新证明技术，我们证明了自适应安全性。由于保留了紧凑的结构，所提出的R（H）IBE方案对最有效的现有计划具有相似的效率。

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