12 papers
Information-Theoretic Decentralized Secure Aggregation with User Dropouts
Zhou Li, Xiang Zhang, Yizhou Zhao +2
This paper investigates the fundamental limits of information-theoretic decentralized secure aggregation (DSA) with user dropouts. We consider a fully decentralized network where $…
Multi-Server Secure Aggregation with Arbitrary Collusion and Heterogeneous Security Constraints
Zhou Li, Xiang Zhang, Jiguang He +1
We study the fundamental limits of multi-server secure aggregation over a two-hop network where multiple servers, each connected to a disjoint subset of users, jointly compute the…
On the Capacity of Hierarchical Secure Aggregation with Groupwise Keys
Minyang Lu, Zhou Li, Haiqiang Chen +1
We study the hierarchical secure aggregation problem with groupwise keys. The problem consists of an aggregation server, relays, and users, where each relay serves dis…
Information-Theoretic Secure Aggregation over Regular Graphs
Xiang Zhang, Zhou Li, Han Yu +4
Large-scale decentralized learning frameworks such as federated learning (FL), require both communication efficiency and strong data security, motivating the study of secure aggreg…
On the Extremal Source Key Rates for Secure Storage over Graphs
Zhou Li
This paper investigates secure storage codes over graphs, where multiple independent source symbols are encoded and stored at graph nodes subject to edge-wise correctness and secur…
Optimal Rate Region for Multi-server Secure Aggregation with User Collusion
Zhou Li, Xiang Zhang, Kai Wan +3
Secure aggregation is a fundamental primitive in privacy-preserving distributed learning systems, where an aggregator aims to compute the sum of users' inputs without revealing ind…
Information-Theoretic Secure Aggregation in Decentralized Networks
Xiang Zhang, Zhou Li, Shuangyang Li +3
Motivated by the increasing demand for data security in decentralized federated learning (FL) and stochastic optimization, we formulate and investigate the problem of information-t…
Optimal Key Rates for Decentralized Secure Aggregation with Arbitrary Collusion and Heterogeneous Security Constraints
Zhou Li, Xiang Zhang, Giuseppe Caire
Decentralized secure aggregation (DSA) considers a fully-connected network of users, where each pair of users can communicate bidirectionally over an error-free channel. Each u…
The Capacity of Collusion-Resilient Decentralized Secure Aggregation with Groupwise Keys
Zhou Li, Xiang Zhang, Yizhou Zhao +3
This paper investigates the information-theoretic decentralized secure aggregation (DSA) problem under practical groupwise secret keys and collusion resilience. In DSA, users a…
Graph-Theoretic Characterization of Noise Capacity of Conditional Disclosure of Secrets
Zhou Li, Siyan Qin, Xiang Zhang +3
In the Conditional Disclosure of Secrets (CDS) problem, Alice and Bob hold inputs and and share a secret. Let $f:\mathcal{X}\times\mathcal{Y}\…
Information-Theoretic Decentralized Secure Aggregation with Passive Collusion Resilience
Xiang Zhang, Zhou Li, Shuangyang Li +3
In decentralized federated learning (FL), multiple clients collaboratively learn a shared machine learning (ML) model by leveraging their privately held datasets distributed across…
Hierarchical Secure Aggregation with Heterogeneous Security Constraints and Arbitrary User Collusion
Zhou Li, Xiang Zhang, Jiawen Lv +3
In hierarchical secure aggregation (HSA), a server communicates with clustered users through an intermediate layer of relays to compute the sum of users' inputs under two security…