An Alternative View of the Graph-Induced Multilinear Maps

In this paper, we view multilinear maps through the lens of “homomorphic obfuscation”. In specific, we show how to homomorphically obfuscate the kernel-test and affine subspace-test functionalities of high dimensional matrices. Namely, the evaluator is able to perform additions and multiplications over the obfuscated matrices, and test subspace memberships on the resulting code. The homomorphic operations are constrained by the prescribed data structure, e.g. a tree or a graph, where the matrices are stored. The security properties of all the constructions are based on the hardness of Learning with errors problem (LWE). The technical heart is to “control” the “chain reactions” over a sequence of LWE instances. Viewing the homomorphic obfuscation scheme from a different angle, it coincides with the graphinduced multilinear maps proposed by Gentry, Gorbunov and Halevi (GGH15). Our proof technique recognizes several “safe modes” of GGH15 that are not known before, inclu...

• Type: Journal
• Year: 2016
• Where: IACR
• Authors: Yilei Chen
• Keywords: Biometrics, IACR 2016