Paper 2013/236 Original: eprint.iacr.org/2013/236 ↗
A Ciphertext-Policy Attribute-Based Proxy Re-Encryption with Chosen-Ciphertext Security
Abstract
Ciphertext-Policy Attribute-Based Proxy Re-Encryption (CP-ABPRE) extends the traditional Proxy Re-Encryption (PRE) by allowing a semi-trusted proxy to transform a ciphertext under an access policy to the one with the same plaintext under another access policy (i.e.attribute-based re-encryption). The proxy, however, learns nothing about the underlying plaintext. CP-ABPRE has many real world applications, such as fine-grained access control in cloud storage systems and medical records sharing among different hospitals. Previous CP-ABPRE schemes leave how to be secure against chosen-ciphertext attacks (CCA) as an open problem. This paper, for the first time, proposes a new CP-ABPRE to tackle the problem. The new scheme supports attribute-based re-encryption with any monotonic access structures. Despite our scheme is constructed in the random oracle model, it can be proved CCA secure under the decisional $q$-parallel bilinear Diffie-Hellman exponent assumption.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2013-04-29: last updated
- 2013-04-29: published
- Short URL
- https://ia.cr/2013/236
- License
- https://creativecommons.org/licenses/by/4.0/
BibTeX
@misc{cryptoeprint:2013/236,
author = {Kaitai Liang and Liming Fang and Duncan S. Wong and Willy Susilo},
title = {A Ciphertext-Policy Attribute-Based Proxy Re-Encryption with Chosen-Ciphertext Security},
howpublished = {Cryptology {ePrint} Archive, Paper 2013/236},
year = {2013},
url = {https://eprint.iacr.org/2013/236}
}