Abstract
In this paper, we propose new non-monotonic attribute-based encryption schemes with compact parameters. The first three schemes are key-policy attribute-based encryption (KP-ABE) and the fourth scheme is ciphertext-policy attribute-based encryption (CP-ABE) scheme.
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Our first scheme achieves the shortest ciphertext overhead in the literature. Compared to the scheme by Attrapadung et al. (PKC2011), which is the best scheme in terms of the ciphertext overhead, our scheme shortens ciphertext overhead by 33%. The scheme also reduces the size of the master public key to about half.
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Our second scheme is proven secure under the decisional bilinear Diffie-Hellman (DBDH) assumption, which is one of the most standard assumptions in bilinear groups. Compared to the non-monotonic KP-ABE scheme from the same assumption by Ostrovsky et al. (ACM-CCS’07), our scheme reduces the size of the master public key and the ciphertext to about half.
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Our third scheme is the first non-monotonic KP-ABE scheme that can deal with unbounded size of set and access policies. That is, there is no restriction on the size of attribute sets and the number of allowed repetition of the same attributes which appear in an access policy. The master public key of our scheme consists of only constant number of group elements.
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Our fourth scheme is the first non-monotonic CP-ABE scheme that can deal with unbounded size of set and access policies. The master public key of the scheme consists of only constant number of group elements.
We construct our KP-ABE schemes in a modular manner. We first introduce special type of predicate encryption that we call two-mode identity based broadcast encryption (TIBBE). Then, we show that any TIBBE scheme that satisfies certain condition can be generically converted into non-monotonic KP-ABE scheme. Finally, we construct efficient TIBBE schemes and apply this conversion to obtain the above new non-monotonic KP-ABE schemes.
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Yamada, S., Attrapadung, N., Hanaoka, G., Kunihiro, N. (2014). A Framework and Compact Constructions for Non-monotonic Attribute-Based Encryption. In: Krawczyk, H. (eds) Public-Key Cryptography – PKC 2014. PKC 2014. Lecture Notes in Computer Science, vol 8383. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-54631-0_16
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