AASSI: A Self-Sovereign Identity Protocol With Anonymity and Accountability

AASSI: A Self-Sovereign Identity Protocol With Anonymity and Accountability

Blog Article

The concern and opposition to centralized management of user identities by third-party authorities have led to the emergence of Self-Sovereign Identity (SSI).With the help of blockchain, SSI effectively restore users’ control over their own identities, but privacy concerns due to blockchain transparency, coupled with B-12 the absence of accountability like Know Your Customer (KYC) and Anti-Money Laundering (AML), have cast uncertainties upon the viability of SSI.In this paper, we bridge this gap by introducing AASSI, a pioneering SSI protocol meticulously designed to balance the twin imperatives of privacy and accountability.Specifically, AASSI extends support for anonymity, self-derivation, fine-grained tracing and selective revocation.

In the realm of anonymity and self-derivation, AASSI introduces redactable signatures, which empowers users to autonomously derive distinctive credentials for each user-service-provider interaction, effectively improving privacy protection and self-management capabilities.Pertaining to fine-grained tracing, the protocol employs a dual-tag system that facilitates tracing users’ real identities as well as a granular historical records of derived credentials.For selective revocation, AASSI leverages dynamic accumulators as a building block to enable the revocation of offending users.Ultimately, we provide functional comparison, which shows that AASSI has robust features, in particular, it supports novel self-derived features that further increase user control over their identity, and fine-grained tracking, which provides more flexibility for tracers.

We demonstrate protocol efficiency through off-chain time-consuming comparison, which show that AASSI dramatically reduces the time overhead of credential verification.Moreover, We test the on-chain communication overhead and experimentally Splashback prove the feasibility of AASSI.