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- W3191289991 abstract "Schnorr’s signature scheme permits an elegant threshold signing protocol due to its linear signing equation. However each new signature consumes fresh randomness, which can be a major attack vector in practice. Sources of randomness in deployments are frequently either unreliable, or require state continuity, i.e. reliable fresh state resilient to rollbacks. State continuity is a notoriously difficult guarantee to achieve in practice, due to system crashes caused by software errors, malicious actors, or power supply interruptions (Parno et al., S&P ’11). This is a non-issue for Schnorr variants such as EdDSA, which is specified to derive nonces deterministically as a function of the message and the secret key. However, it is challenging to translate these benefits to the threshold setting, specifically to construct a threshold Schnorr scheme where signing neither requires parties to consume fresh randomness nor update long-term secret state. In this work, we construct a dishonest majority threshold Schnorr protocol that enables such stateless deterministic nonce derivation using standardized block ciphers. Our core technical ingredients are new tools for the zero-knowledge from garbled circuits (ZKGC) paradigm to aid in verifying correct nonce derivation: A proof per our scheme requires only a small constant number of exponentiations." @default.
- W3191289991 created "2021-08-16" @default.
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- W3191289991 date "2021-01-01" @default.
- W3191289991 modified "2023-10-01" @default.
- W3191289991 title "Threshold Schnorr with Stateless Deterministic Signing from Standard Assumptions" @default.
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- W3191289991 doi "https://doi.org/10.1007/978-3-030-84242-0_6" @default.
- W3191289991 hasPublicationYear "2021" @default.
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