[Resource Topic] 2022/1232: The Abe-Okamoto Partially Blind Signature Scheme Revisited

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The Abe-Okamoto Partially Blind Signature Scheme Revisited

Authors: Julia Kastner, Julian Loss, Jiayu Xu


Partially blind signatures, an extension of ordinary blind signatures, are a primitive with wide applications in e-cash and electronic voting. One of the most efficient schemes to date is the one by Abe and Okamoto (CRYPTO 2000), whose underlying idea - the OR-proof technique - has served as the basis for several works.

We point out several subtle flaws in the original proof of security, and provide a new detailed and rigorous proof, achieving similar bounds as the original work. We believe our insights on the proof strategy will find useful in the security analyses of other OR-proof-based schemes.

ePrint: https://eprint.iacr.org/2022/1232

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