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International Association for Cryptologic Research (IACR)
Abstract
We construct the first constant-size hierarchical identity-based signature (HIBS) without random oracles - the signature size is O(λs​) bits, where λs​ is the security parameter, and it is independent of the number of levels in the hierarchy.
We observe that an efficient hierarchical identity-based signcryption (HIBSC) scheme without random oracles can be compositioned from our HIBS and Boneh, Boyen, and Goh\u27s hierarchical identity-based encryption (HIBE). We further optimize it to a constant-factor efficiency improvement. This is the first constant-size HIBSC without random oracles
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