Strong Existential Unforgeability and More of MPC-in-the-Head Signatures

ePrint Report: Strong Existential Unforgeability and More of MPC-in-the-Head Signatures

Mukul Kulkarni, Keita Xagawa

NIST started the standardization of additional post-quantum signatures in 2022. Among 40 candidates, a few of them showed their stronger security than existential unforgeability, strong existential unforgeability and BUFF (beyond unforgeability features) securities. Recently, Aulbach, Düzlü, Meyer, Struck, and Weishäupl (PQCrypto 2024) examined the BUFF securities of 17 out of 40 candidates. Unfortunately, on the so-called MPC-in-the-Head (MPCitH) signature schemes, we have no knowledge …

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