Fully-Adaptive Two-Round Threshold Schnorr Signatures from DDH↗ (원문, 새 창)

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Threshold Schnorr signatures enable $t$-out-of-$n$ parties to collaboratively produce signatures that are indistinguishable from standard Schnorr signatures, ensuring compatibility with existing verification systems. While static-secure constructions are well understood and achieve optimal round complexity, obtaining full adaptive security - withstanding up to $t-1$ dynamic corruptions under standard assumptions has proven elusive: Recent impossibility results (CRYPTO’25) either rule out known p