The Abe-Okamoto Partially Blind Signature Scheme Revisited

Kastner, Julia and Loss, Julian and Xu, Jiayu
(2022) The Abe-Okamoto Partially Blind Signature Scheme Revisited.
In: ASIACRYPT 2022, 5-9 December 2022, Taipei, Taiwan.
Conference: ASIACRYPT International Conference on the Theory and Application of Cryptology and Information Security
(In Press)

2022-1232.pdf - Accepted Version

Download (687kB) | Preview


Partially blind signatures, an extension of ordinary blind sig- natures, 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.


Actions (login required)

View Item View Item