CanDID: Can-Do Decentralized Identity（Oakland 21）
While decentralized identity (DID) promises to give users greater control over their private data, it burdens users with management of private keys, creating a significant risk of key loss. Existing and proposed approaches also presume the spontaneous availability of a credential-issuance ecosystem, creating a bootstrapping problem. They also omit essential functionality, like resistance to Sybil attacks and the ability to detect misbehaving or sanctioned users while preserving user privacy.
In this talk, I’ll introduce CanDID [Oakland 21], a platform for practical, user-friendly realization of decentralized identity, the idea of empowering end users with management of their own credentials. CanDID addresses these challenges by issuing credentials in a user-friendly way that draws securely and privately on data from existing, unmodified web service providers. Such legacy compatibility similarly enables CanDID users to leverage their existing online accounts for recovery of lost keys. Using a decentralized committee of nodes, CanDID provides strong confidentiality for user’s keys, real-world identities, and data, yet prevents users from spawning multiple identities and allows identification (and blacklisting) of sanctioned users.
I’ll present the CanDID architecture and its technical innovations and report on experiments demonstrating its practical performance.
Dr. Zhang is an Assistant Professor in the Department of Computer Science at Duke University. His recent research interests include the security, privacy and scalability of decentralized systems, in particular those enabled by blockchains and trusted execution environments (TEEs). His works have been featured in Forbes, MIT Tech Review, IEEE Spectrum, CoinDesk, BitcoinMagazine, and numerous other blockchain news outlets. Several of his works have seen industry uptake. He received a Ph.D. in Computer Science from Cornell University, advised by Prof. Ari Juels. He is a member of IC3 and a recipient of an IBM Ph.D. Fellowship for 2018-2020. He received a B.Eng from Tsinghua University, China. In his separate capacity, he is security researcher at Chainlink Labs.