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- W2918751600 abstract "An emerging trend is for researchers to identify cryptography primitives for which feasibility was first established under obfuscation and then move the realization to a different setting. In this work we explore a new such avenue—to move obfuscation-based cryptography to the assumption of (positional) witness encryption. Our goal is to develop techniques and tools, which we will dub “witness encryption friendly” primitives and use these to develop a methodology for building advanced cryptography from positional witness encryption. We take a bottom up approach and pursue our general agenda by attacking the specific problem of building collusion-resistant broadcast systems with tracing from positional witness encryption. We achieve a system where the size of ciphertexts, public key and private key are polynomial in the security parameter $$lambda $$ and independent of the number of users N in the broadcast system. Currently, systems with such parameters are only known from indistinguishability obfuscation." @default.
- W2918751600 created "2019-03-11" @default.
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- W2918751600 date "2019-01-01" @default.
- W2918751600 modified "2023-10-11" @default.
- W2918751600 title "Collusion Resistant Broadcast and Trace from Positional Witness Encryption" @default.
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- W2918751600 doi "https://doi.org/10.1007/978-3-030-17259-6_1" @default.
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