Paper 2021/867

Key-Policy ABE with Delegation of Rights

Cécile Delerablée, Lénaïck Gouriou, and David Pointcheval

Abstract

This paper revisits Key-Policy Attribute-Based Encryption, allowing the delegation of keys, traceability of compromised keys and key anonymity, as additional properties. Whereas delegation of rights has been addressed in the seminal paper by Goyal et al. in 2006, introducing KPABE, this nice feature has almost been neglected in all subsequent works in favor of better security levels. However, in multi-device scenarios, this is quite important to allow users to independently authorize their own devices, still with some tracing capabilities and some anonymity properties. To this aim, we define a new primitive with switchable attributes, in both the ciphertexts and the keys, and new indistinguishability properties. We then provide concrete and efficient instantiations with adaptive security under the sole SXDH assumption in the standard model.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. Minor revision.
Keywords
KP-ABEDelegation
Contact author(s)
lenaick gouriou @ ens fr
david pointcheval @ ens fr
History
2021-10-01: last of 3 revisions
2021-06-24: received
See all versions
Short URL
https://ia.cr/2021/867
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2021/867,
      author = {Cécile Delerablée and Lénaïck Gouriou and David Pointcheval},
      title = {Key-Policy ABE with Delegation of Rights},
      howpublished = {Cryptology ePrint Archive, Paper 2021/867},
      year = {2021},
      note = {\url{https://eprint.iacr.org/2021/867}},
      url = {https://eprint.iacr.org/2021/867}
}
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