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Tightly Secure Hierarchical Identity-Based Encryption
2020
Journal of Cryptology
We construct the first tightly secure hierarchical identity-based encryption (HIBE) scheme based on standard assumptions, which solves an open problem from Blazy, Kiltz, and Pan (CRYPTO 2014). At the core of our constructions is a novel randomization technique that enables us to randomize user secret keys for identities with flexible length. The security reductions of previous HIBEs lose at least a factor of Q, which is the number of user secret key queries. Different to that, the security loss
doi:10.1007/s00145-020-09356-x
fatcat:qk7flxdpufdpzppt7h2ae2hspi