A Ciphertext-Policy Attribute-Based Encryption Scheme with Constant Ciphertext Length

Authors:
Keita Emura;Atsuko Miyaji;Akito Nomura;Kazumasa Omote;Masakazu Soshi
Affiliations:
School of Information Science, Japan Advanced Institute of Science and Technology, Nomi, Japan 923-1292;School of Information Science, Japan Advanced Institute of Science and Technology, Nomi, Japan 923-1292;Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, Japan 920-1192;School of Information Science, Japan Advanced Institute of Science and Technology, Nomi, Japan 923-1292;Graduate School of Information Sciences, Hiroshima City University, Hiroshima, Japan 731-3194
Venue:
ISPEC '09 Proceedings of the 5th International Conference on Information Security Practice and Experience
Year:
2009

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Abstract

An Attribute-Based Encryption (ABE) is an encryption scheme, where users with some attributes can decrypt ciphertexts associated with these attributes. However, the length of the ciphertext depends on the number of attributes in previous ABE schemes. In this paper, we propose a new Ciphertext-Policy Attribute-Based Encryption (CP-ABE) with constant ciphertext length. Moreover, the number of pairing computations is also constant.