International Association for Cryptologic Research

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A Note on Adaptive Security in Hierarchical Identity-Based Encryption

Authors:
Rishab Goyal , UW-Madison
Venkata Koppula , Indian Institute of Technology Delhi
Mahesh Sreekumar Rajasree , CISPA Helmholtz Center for Information Security
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Conference: CRYPTO 2025
Abstract: We present the first construction for adaptively secure HIBE, that does not rely on bilinear pairings or random oracle heuristics. Notably, we design an adaptively secure HIBE from any selectively secure IBE system in the standard model. Combining this with known results, this gives the first adaptively secure HIBE system from a wide variety of standard assumptions such as CDH/Factoring/LWE/LPN. We also extend our adaptively secure HIBE system to satisfy full anonymity, giving the first adaptively secure anonymous HIBE under CDH/LWE assumption. All our HIBE systems support unbounded length identities as well as unbounded number of recursive delegation operations.
BibTeX
@inproceedings{crypto-2025-35624,
  title={A Note on Adaptive Security in Hierarchical Identity-Based Encryption},
  publisher={Springer-Verlag},
  author={Rishab Goyal and Venkata Koppula and Mahesh Sreekumar Rajasree},
  year=2025
}