Security of Blind Signature Schemes in the Concurrent Setting

Chris Huang

5/2/23, 3:01 AM

I am quite confused about the security definition of blind signature schemes in the concurrent setting. I have found a paper as follows showing that most of the previous blind signature schemes cannot satisfy unforgeability property if they are deployed in the concurrent setting.

Benhamouda, Fabrice, et al. "On the (in) security of ROS." Annual International Conference on the Theory and Applications of Cryptographic Techniques. Springer, Cham, 2021.

Does this mean that most of the previous blind signature schemes do not allow multiple users to request blind signatures from a signer at the same time?

In other words, if multiple users want to request blind signatures and send their requests to a signer, the signer cannot handle them concurrently. It starts to sign one request of one user and pauses the other requests, and after the signing session is finished, it signs the next request of another user.

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blind-signature

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Security of Blind Signature Schemes in the Concurrent Setting

TH: ความปลอดภัยของ Blind Signature Schemes ในการตั้งค่าพร้อมกัน

RO: Securitatea schemelor de semnătură oarbă în setarea concomitentă

RU: Безопасность схем слепой подписи в параллельных условиях

VI: An ninh của sơ đồ chữ ký mù trong cài đặt đồng thời

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