Title

Adaptable ciphertext-policy attribute-based encryption

Publication Type

Conference Proceeding Article

Publication Date

11-2013

Abstract

In this paper, we introduce a new cryptographic primitive, called adaptable ciphertext-policy attribute-based encryption (CP-ABE). Adaptable CP-ABE extends the traditional CP-ABE by allowing a semi-trusted proxy to modify a ciphertext under one access policy into ciphertexts of the same plaintext under any other access policies; the proxy, however, learns nothing about the underlying plaintext. With such “adaptability” possessed by the proxy, adaptable CP-ABE has many real world applications, such as handling policy changes in CP-ABE encryption of cloud data and outsourcing of CP-ABE encryption. Specifically, we first specify a formal model of adaptable CP-ABE; then, based on the CP-ABE scheme by Waters, we propose a concrete adaptable CP-ABE scheme and further prove its security under our security model.

Keywords

Ciphertext, Policy attribute. Based encryption, Adaptability, Policy change

Discipline

Information Security

Research Areas

Information Security and Trust

Publication

Pairing-Based Cryptography - Pairing 2013: 6th International Conference, Beijing, China, November 22-24: Revised Selected Papers

Volume

8365

First Page

199

Last Page

214

ISBN

9783319048734

Identifier

10.1007/978-3-319-04873-4_12

Publisher

Springer Verlag

City or Country

Beijing, China

Additional URL

http://dx.doi.org/10.1007/978-3-319-04873-4_12