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Non-interactive Zaps of Knowledge


While non-interactive zero-knowledge (NIZK) proofs require trusted parameters, Groth, Ostrovsky and Sahai constructed non-interactive witness-indistinguishable (NIWI) proofs without any setup; they called their scheme a non-interactive zap. More recently, Bellare, Fuchsbauer and Scafuro investigated the security of NIZK in the face of parameter subversion and observe that NI zaps provide subversion-resistant soundness and WI. Arguments of knowledge prove that not only the statement is true, but also that the prover knows a witness for it, which is essential for anonymous identification. We present the first NIWI argument of knowledge without parameters, i.e., a NI zap of knowledge. Consequently, our scheme is also the first subversion-resistant knowledge-sound proof system, a notion recently proposed by Fuchsbauer.
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hal-01870005 , version 1 (07-09-2018)



Georg Fuchsbauer, Michele Orrù. Non-interactive Zaps of Knowledge. ACNS 2018 - 16th International Conference on Applied Cryptography and Network Security, Jul 2018, Leuven, Belgium. pp.44-62, ⟨10.1007/978-3-319-93387-0_3⟩. ⟨hal-01870005⟩
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