A Ciphertext-Policy Attribute-Based Proxy Re-Encryption with Chosen-Ciphertext Security

Kaitai Liang; Liming Fang; Duncan S.  Wong; Willy Susilo

Paper 2013/236

A Ciphertext-Policy Attribute-Based Proxy Re-Encryption with Chosen-Ciphertext Security

Kaitai Liang, Liming Fang, Duncan S. Wong, and Willy Susilo

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: Published elsewhere. Unknown where it was published
Contact author(s): kliang4-c @ my cityu edu hk
History: 2013-04-29: received
Short URL: https://ia.cr/2013/236
License: CC BY

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}
}