Paper 2023/712

Optimizing Attribute-based Encryption for Circuits using Compartmented Access Structures

Alexandru Ionita, "Alexandru Ioan Cuza" University of Iasi
Abstract

Attribute-based encryption (ABE) is an asymmetric encryption method that allows expressive access granting mechanisms, with high applicability in modern IT infrastructure, such as Cloud or IoT systems. (Ezhilarasi et al., 2021; Touati and Challal, 2016) One open problem regarding ABE is using Boolean circuits as access structures. While Boolean Formulae were supported since the first ABE scheme proposed, there is still no efficient construction that supports Boolean circuits. We propose a new ABE scheme for a new access structure type, situated between Boolean formulae and Boolean circuits in terms of expressiveness. This key point in our construction is the usage of CAS-nodes, a structure modeling compartmented groups access structures. We also show that our CAS-nodes can be used to improve the efficiency of existing ABE schemes for Boolean circuits. Our construction is secure in the Selective Set Model under the bilinear Decisional Diffie-Hellman Assumption.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. SECRYPT, 2023, to appear
Keywords
attribute-based encryptionbilinear mapsBoolean circuitsaccess control
Contact author(s)
juve45 @ rocketmail com
History
2023-05-22: approved
2023-05-17: received
See all versions
Short URL
https://ia.cr/2023/712
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2023/712,
      author = {Alexandru Ionita},
      title = {Optimizing Attribute-based Encryption for Circuits using Compartmented Access Structures},
      howpublished = {Cryptology ePrint Archive, Paper 2023/712},
      year = {2023},
      note = {\url{https://eprint.iacr.org/2023/712}},
      url = {https://eprint.iacr.org/2023/712}
}
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