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- W2293622464 abstract "We propose a new cryptographic primitive called witness pseudorandom functions (witness PRFs). Witness PRFs are related to witness encryption, but appear strictly stronger: we show that witness PRFs can be used for applications such as multi-party key exchange without trusted setup, polynomially-many hardcore bits for any one-way function, and several others that were previously only possible using obfuscation. Thus we improve the minimal assumptions required for these applications. Moreover, current candidate obfuscators are far from practical and typically rely on unnatural hardness assumptions about multilinear maps. We give a construction of witness PRFs from multilinear maps that is simpler and much more efficient than current obfuscation candidates, thus bringing several applications of obfuscation closer to practice. Our construction relies on new but very natural hardness assumptions about the underlying maps that appear to be resistant to a recent line of attacks." @default.
- W2293622464 created "2016-06-24" @default.
- W2293622464 creator A5024874638 @default.
- W2293622464 date "2015-12-24" @default.
- W2293622464 modified "2023-10-11" @default.
- W2293622464 title "How to Avoid Obfuscation Using Witness PRFs" @default.
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- W2293622464 doi "https://doi.org/10.1007/978-3-662-49099-0_16" @default.
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