Hide-and-Seek and the Non-Resignability of the BUFF Transform

ePrint Report: Hide-and-Seek and the Non-Resignability of the BUFF Transform

Jelle Don, Serge Fehr, Yu-Hsuan Huang, Jyun-Jie Liao, Patrick Struck

The BUFF transform, due to Cremers et al. (S&P'21), is a generic transformation for digital signature scheme, with the purpose of obtaining additional security guarantees beyond unforgeability: exclusive ownership, message-bound signatures, and non-resignability. Non-resignability (which essentially challenges an adversary to re-sign an unknown message for which it only obtains the signature) turned out to be a delicate matter, as recently …

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