Schnorr Signatures … How To Sign and Merge Public Keys (with Multiple Signers)

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In Feb 1989, Claus Schnorr submitted a patent which was assigned to no one. It has 11 claims, and allowed digital signatures to be merged for multiple signers [here]:

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Prof Bill Buchanan OBE FRSE
ASecuritySite: When Bob Met Alice

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.