A note on anonymous credentials using BLS signatures

TL;DR

This paper explores how BLS signature aggregation can create efficient anonymous credentials supporting selective disclosure, combining cryptographic techniques to enhance privacy and applicability in distributed systems.

Contribution

It introduces a novel use of BLS signatures for content extraction signatures, enabling privacy-preserving credential schemes with proof capabilities.

Findings

Efficient construction of Content Extraction Signatures using BLS aggregation

Application of CES in client-server and distributed ledger credential schemes

Sketch of a protocol combining CES with NIZK for predicate proofs

Abstract

In this note, we remark that the aggregation property of the BLS signature scheme yields an efficient Content Extraction Signature (CES). This construction can be used to build digital credentials that support selective disclosure in various settings. Interestingly, this construction is efficient and well suited to build credential issuance schemes with various applications in the client-server or in the distributed ledger models. Finally, we sketch a protocol that combines the CES with the use of a NIZK which allows to prove predicate satisfaction on claims extracted from a credential, while keeping the data secret.