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• W3155111802 abstract "We present a candidate obfuscator based on composite-order graded encoding schemes (GES), which are a generalization of multilinear maps. Our obfuscator operates on circuits directly without converting them into formulas or branching programs as was done in previous solutions. As a result, the time and size complexity of the obfuscated program, measured by the number of GES elements, is directly proportional to the circuit complexity of the program being obfuscated. This improves upon previous constructions whose complexity was related to the formula or branching program size. Known instantiations of Graded Encoding Schemes allow us to obfuscate circuit classes of polynomial degree, which include for example families of circuits of logarithmic depth. We prove that our obfuscator is secure against a class of generic algebraic attacks, formulated by a generic graded encoding model. We further consider a more robust model which provides more power to the adversary and extend our results to this setting as well. As a secondary contribution, we define a new simple notion of algebraic security (which was implicit in previous works) and show that it captures standard security relative to an ideal GES oracle." @default.
• W3155111802 created "2021-04-26" @default.
• W3155111802 creator A5023852532 @default.
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• W3155111802 date "2021-04-01" @default.
• W3155111802 modified "2023-09-23" @default.
• W3155111802 title "Obfuscating Circuits Via Composite-Order Graded Encoding" @default.
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• W3155111802 doi "https://doi.org/10.1007/s00145-021-09378-z" @default.
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