It is of critical importance to design digital identity systems that ensure the privacy of citizens as well as protecting them from issuer corruption. Unfortunately, what Europe's and USA's public sectors are currently developing does not offer such basic protections. We aim to solve this issue and propose a method for untraceable selective disclosure and privacy preserving revocation of digital credentials, using the unique homomorphic characteristics of second order Elliptic Curves and Boneh-Lynn-Shacham (BLS) signatures. Our approach ensures that users can selectively reveal only the necessary credentials, while protecting their privacy across multiple presentations. We also aim to protect users from issuer corruption, by making it possible to apply a threshold for revocation to require collective agreement among multiple revocation issuers.

翻译：设计能够确保公民隐私并保护其免受发行方腐败侵害的数字身份系统至关重要。遗憾的是，目前欧洲和美国公共部门正在开发的系统并未提供此类基本保护。我们旨在解决这一问题，提出一种基于二阶椭圆曲线独特同态特性与Boneh-Lynn-Shacham（BLS）签名的不可追踪选择性披露及隐私保护式数字凭证撤销方法。该方案确保用户能够选择性披露必要凭证，同时在多次出示过程中保护其隐私。我们还通过设置撤销阈值要求多个撤销发行方达成集体共识，以保护用户免受发行方腐败的影响。