Adaptable ciphertext-policy attribute-based encryption
Conference Proceeding Article
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.
Ciphertext, Policy attribute. Based encryption, Adaptability, Policy change
Information Security and Trust
Pairing-Based Cryptography - Pairing 2013: 6th International Conference, Beijing, China, November 22-24: Revised Selected Papers
City or Country
LAI, Junzuo; DENG, Robert H.; YANG, Yanjiang; and Weng, Jian.
Adaptable ciphertext-policy attribute-based encryption. (2013). Pairing-Based Cryptography - Pairing 2013: 6th International Conference, Beijing, China, November 22-24: Revised Selected Papers. 8365, 199-214. Research Collection School Of Information Systems.
Available at: http://ink.library.smu.edu.sg/sis_research/1950