IACR News item: 22 July 2019
Yuechen Chen, Linru Zhang, Siu-Ming Yiu
ePrint Report
Functional encryption (FE) that bases on user attributes has many useful practical applications. For example, a company may only authorize department heads of other sections to query the average sale figures of the sales department from the encrypted sales amounts of all sales. However, FE schemes that can solve this problem are based on new, but not well-studied assumptions (such as indistinguishable obfuscation or multilinear maps). It is not clear if these FE schemes are secure. In this paper, we develop the first functional encryption scheme (ABFE) from simple and well-studied assumptions that can authorize a user base on the user's attributes to obtain a functional value of the encrypted data.
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