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- W3029672642 abstract "We propose a key-policy attribute-based encryption (KP-ABE) scheme with constantsize ciphertexts, whose semi-adaptive security is proven under the decisional linear (DLIN) assumption in the standard model. The access structure is expressive, that is given by non-monotone span programs. It also has fast decryption, i.e., a decryption includes only a constant number of pairing operations. As an application of our KP-ABE construction, we also propose a fully secure attribute-based signatures with constant-size secret (signing) keys from the DLIN. For achieving the above results, we extend the sparse matrix technique on dual pairing vector spaces. In particular, several algebraic properties of an elaborately chosen sparse matrix group are applied to the dual system security proofs. ∗An extended abstract of a preliminary version of this paper is presented at SCN 2014, the 9th Conference on Security and Cryptography for Networks. This is the full version, and provides significant technical contributions over the preliminary version, e.g., semi-adaptive security from DLIN with reduction factor O(n), where n is the maximum number of attributes per ciphertext. Refer to Table 1 in Section 1.2 and Theorem 1 in Section 6.1." @default.
- W3029672642 created "2020-06-05" @default.
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- W3029672642 date "2014-01-01" @default.
- W3029672642 modified "2023-09-26" @default.
- W3029672642 title "Expressive Attribute-Based Encryption with Constant-Size Ciphertexts from the Decisional Linear Assumption." @default.
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