Abstract. On both sides of the Atlantic, governments are working on creating digital identity apps that citizens can use in order to prove their identity or identity attributes. In a privacy-preserving approach to such apps, a credential would be a government's (or other authority's) signature on a person's identity attributes. In order to demonstrate that the user has a credential, the user's identity app would have to conduct a zero-knowledge proof of knowledge of such a signature. Thus, signature schemes with efficient protocols are the required building block for privacy-preserving authentication. In this talk we will go over the state of the art of such signature schemes.
Suggested readings: Cryptographers' Feedback on the EU Digital Identity’s ARF (2024-Jun-19); ACLU Digital ID State Legislative Recommendations (2024-Oct-10)
Security and Privacy: cryptography