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In order to ensure the security of users’ information effectively, this paper investigates ciphertext-based attribute encryption. Homomorphic encryption can settle the problems of data privacy in cloud environments, in the way that can be operated directly to achieve the same result as for plaintext operations. In this paper, on the premise of attribute encryption, we propose an attribute-based fully...
We study the hardness of learning with errors (LWE) problem with some equation constraints ( $$\hbox {LWE}_{n,l,q,\chi }$$ LWE n , l , q , χ , some-are-errorless LWE). Previously, it was proved that LWE with one equation (first-is-errorless LWE) can be made as hard as the standard $$\hbox {LWE}_{n,q,\chi }$$ LWE n , q , χ , given a large lattice dimension n. We show that the some-are-errorless...
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