Concurrently-Secure Blind Signatures without Random Oracles or Setup Assumptions

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Provided by: Bar-Ilan University
Topic: Security
Format: PDF
Blind signature schemes, introduced by the researcher, are a fascinating primitive that (roughly speaking) enable a user to interact with a signer and obtain a signature on a message m without revealing anything about m to the signer. The authors show a new protocol for blind signatures in which security is preserved even under arbitrarily-many concurrent executions. The protocol can be based on standard cryptographic assumptions and is the first to be proven secure in a concurrent setting (under any assumptions) without random oracles or a trusted setup assumption such as a common reference string. Along the way, they also introduce new definitions of security for blind signature schemes.
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