Attribute-based encryption supporting data filtration over post-quantum assumptions

摘要

As the internet becomes prevalent, plenty of sensitive data is being transferred in open networks environment. It is worth concerning how to achieve efficient data transfer in a privacy-preserving manner. Although attribute-based encryption (ABE) can achieve fine-grained access control over encrypted data, it still could not work for restricting unauthorised user to access. In this paper, we introduce a new cryptographic primitive called attribute-based encryption supporting data filtration (ABE-SDF), and formalise the security mode by incorporating the advantages into previous ABE. Finally, we present an efficient construction of the scheme over post-quantum assumptions our scheme is believed to be quantum-resistant owing to the special property of lattices. Based on the LWE assumption, we prove that the proposed scheme has the indistinguishability against selective chosen plaintext attacks and the authentication information security.