Differential Trust: Dynamic Multi-Authority Anonymous Credentials with Epoch-Weighted Updates
Researchers propose MA-ACEW, the first multi-authority anonymous credential model with epoch-weighted issuance and efficient cross-epoch credential updates.
The paper introduces MA-ACEW, a multi-authority anonymous credential scheme that weights authorities differently during credential issuance, targeting decentralized systems such as Proof-of-Stake networks. Its core primitive, Epoch-Bound Pointcheval-Sanders Signatures (EB-PS), binds signatures to time epochs, enabling non-interactive credential updates when authority weight distributions change. The authors formalize EUF-eCMA unforgeability and prove unforgeability, anonymity, and blindness under a novel STB-GPS assumption. Aggregating a credential from 128 partial credentials takes about 10.68 ms on average.
- First multi-authority anonymous credential model incorporating authority weight distribution
- Epoch-Bound Pointcheval-Sanders signatures enable non-interactive updates across epochs
- Unforgeability, anonymity, and blindness proven under novel STB-GPS assumption
- Aggregating 128 partial credentials takes only 10.68 ms on average
- Products
- MA-ACEW
From the original article
1 min read at arxiv.orgAnonymous credentials (ACs) are fundamental to privacy-preserving authentication, allowing users to prove possession of attributes without revealing their identities. State-of-the-art ACs distribute credential issuance across multiple authorities, typically employing techniques such as Shamir's secret sharing or aggregate signatures.
By Chen Li · arxiv.org
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