Improved Concurrent-Secure Blind Schnorr Signatures

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Since the work of Chaum in ’82, the problem of designing secure blind signature protocols for existing signature schemes has been of great interest. In particular, when considering Schnorr signatures, nowadays used in Bitcoin, designing corresponding efficient and secure blind signature schemes is very challenging in light of the ROS attack (Eurocrypt’21), which affected all previous efficient constructions. Currently, the main positive result about concurrent-secure blind Schnorr signatures