Institute of Information Science, Academia Sinica

Attribute based encryption is a generalization of encryption scheme which allows fine-grained access control. Since its proposal, there has been numerous works on its construction, variation, and application. Among the existing lattice-based ABE, the techniques around lattice trapdoor plays a crucial role in the construction. Very recently, Wee [Eurocrypt'22] proposed the evasive LWE assumption, a new trapdoor-related assumption that shows new possibility on constructing efficient ABE from lattice. In this talk, I will give some overview on the background of lattice trapdoor and lattice-based ABE construction. I will then talk about how the evasive LWE assumption can be helpful toward constructing efficient ABE.