Ciphertext policy multi-dimensional range encryption

Authors:
Kohei Kasamatsu;Takahiro Matsuda;Goichiro Hanaoka;Hideki Imai
Affiliations:
Chuo University, Japan,National Institute of Advanced Industrial Science and Technology, Japan;National Institute of Advanced Industrial Science and Technology, Japan;National Institute of Advanced Industrial Science and Technology, Japan;Chuo University, Japan
Venue:
ICISC'12 Proceedings of the 15th international conference on Information Security and Cryptology
Year:
2012

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Abstract

There are many applications in which services are provided only if some values associated with some confidential (encrypted) data are within a specific range. In this paper, we propose the notion of (ciphertext-policy) range encryption (RE) that can be used in many of such applications. RE is a type of public key encryption with additional functionality where an encryptor can freely specify a range to a ciphertext so that it can be decrypted only if the values associated with the key belong to the range. We propose a concrete RE scheme based on the time-specific encryption scheme by Kasamatsu et al. (SCN2012). Our RE scheme is selectively secure under the weak bilinear Diffie-Hellman inversion assumption.