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- W3193292007 abstract "Practical anonymous credential systems are generally built around sigma-protocol ZK proofs. This requires that credentials be based on specially formed signatures. Here we ask whether we can instead use a standard say, RSA, or ECDSA signature that includes formatting and hashing messages, as a credential, and still provide privacy. Existing techniques do not provide efficient solutions for proving knowledge of such a signature: On the one hand, ZK proofs based on garbled circuits Jawurek et al. 2013 give efficient proofs for checking formatting of messages and evaluating hash functions. On the other hand they are expensive for checking algebraic relations such as RSA or discrete-log, which can be done efficiently with sigma protocols.We design new constructions obtaining the best of both worlds: combining the efficiency of the garbled circuit approach for non-algebraic statements and that of sigma protocols for algebraic ones. We then discuss how to use these as building-blocks to construct privacy-preserving credential systems based on standard RSA and ECDSA signatures.Other applications of our techniques include anonymous credentials with more complex policies, the ability to efficiently switch between commitments and signatures in different groups, and secure two-party computation on committed/signed inputs." @default.
- W3193292007 created "2021-08-30" @default.
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- W3193292007 date "2016-01-01" @default.
- W3193292007 modified "2023-09-23" @default.
- W3193292007 title "Efficient Zero-Knowledge Proof of Algebraic and Non-Algebraic Statements with Applications to Privacy Preserving Credentials." @default.
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