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- W3208694691 abstract "Inner product encryption (IPE) generates a secret key for a predicate vector and encrypts a message under an attribute vector such that recovery of the message from a ciphertext requires the vectors to satisfy a linear relation. In the case of zero IPE (ZIPE), the relation holds if the inner product between the predicate and attribute vectors is zero. Over the years, several ZIPE schemes have been proposed with numerous applications. However, most of the schemes compute inner products for bounded length vectors in the sense that a pre-specified bound on the length of predicate/attribute vectors must be fixed while producing the system parameters. On the other hand, an unbounded ZIPE (UZIPE) provides freedom to select the length of vectors at the time of generating keys or producing ciphertexts. The feature of unboundedness expands the applicability of ZIPE in the scenario where the length of vectors varies or is not known in advance. Achieving UZIPE with short secret keys and ciphertexts is the main goal of this paper. More specifically, we present an efficient UZIPE scheme based on symmetric external Diffie-Hellman assumption (SXDH) in the standard model. Our UZIPE enjoys short secret keys and ciphertexts which reduce storage and communication costs. Moreover, we prove security in the adaptively fully attribute-hiding model meaning that the ciphertexts of our UZIPE hide the payload along with the attribute vector. On the technical side, our work takes inspiration from the unbounded inner product functional encryption (UIPFE) of Tomida and Takashima (ASIACRYPT’18) and modifies their framework to UZIPE with efficiency improvements regarding the sizes of ciphertexts and keys. As UIPFE does not generically imply UZIPE, our scheme goes through several technical modifications in the construction and security analysis over the UIPFE." @default.
- W3208694691 created "2021-11-08" @default.
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- W3208694691 date "2021-01-01" @default.
- W3208694691 modified "2023-09-27" @default.
- W3208694691 title "Fully Secure Unbounded Zero Inner Product Encryption with Short Ciphertexts and Keys" @default.
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- W3208694691 doi "https://doi.org/10.1007/978-3-030-90402-9_13" @default.
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