We address the problem of user fast revocation in the lattice-based Ciphertext Policy Attribute-Based Encryption (CP-ABE) by extending the scheme originally introduced by Zhang and Zhang [Zhang J, Zhang Z. A ciphertext policy attribute-based encryption scheme without pairings. In: International Conference on Information Security and Cryptology. Springer; 2011. p. 324-40. doi: https://doi.org/10.1007/978-3-642-34704-7_23.]. While a lot of work exists on the construction of revocable schemes for CP-ABE based on pairings, works based on lattices are not so common, and - to the best of our knowledge - we introduce the first server-aided revocation scheme in a lattice-based CP-ABE scheme, hence being embedded in a post-quantum secure environment. In particular, we rely on semi-trusted "mediators" to provide a multi-step decryption capable of handling mediation without re-encryption. We comment on the scheme and its application, and we provide performance experiments on a prototype implementation in the Attribute-Based Encryption spin-off library of Palisade to evaluate the overhead compared with the original scheme.

Cianfriglia, M., Onofri, E., Pedicini, M. (2024). mRLWE-CP-ABE: A revocable CP-ABE for post-quantum cryptography. JOURNAL OF MATHEMATICAL CRYPTOLOGY, 18(1), 20230026 [10.1515/jmc-2023-0026].

mRLWE-CP-ABE: A revocable CP-ABE for post-quantum cryptography

Cianfriglia, Marco;Onofri, Elia
;
Pedicini, Marco
2024-01-01

Abstract

We address the problem of user fast revocation in the lattice-based Ciphertext Policy Attribute-Based Encryption (CP-ABE) by extending the scheme originally introduced by Zhang and Zhang [Zhang J, Zhang Z. A ciphertext policy attribute-based encryption scheme without pairings. In: International Conference on Information Security and Cryptology. Springer; 2011. p. 324-40. doi: https://doi.org/10.1007/978-3-642-34704-7_23.]. While a lot of work exists on the construction of revocable schemes for CP-ABE based on pairings, works based on lattices are not so common, and - to the best of our knowledge - we introduce the first server-aided revocation scheme in a lattice-based CP-ABE scheme, hence being embedded in a post-quantum secure environment. In particular, we rely on semi-trusted "mediators" to provide a multi-step decryption capable of handling mediation without re-encryption. We comment on the scheme and its application, and we provide performance experiments on a prototype implementation in the Attribute-Based Encryption spin-off library of Palisade to evaluate the overhead compared with the original scheme.
2024
Cianfriglia, M., Onofri, E., Pedicini, M. (2024). mRLWE-CP-ABE: A revocable CP-ABE for post-quantum cryptography. JOURNAL OF MATHEMATICAL CRYPTOLOGY, 18(1), 20230026 [10.1515/jmc-2023-0026].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/465335
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