{"ID":3053367,"CreatedAt":"2026-06-04T04:41:36.695875263Z","UpdatedAt":"2026-06-06T03:31:06.711308811Z","DeletedAt":null,"paper_url":"https://arxiv.org/abs/2606.04411","arxiv_id":"2606.04411","title":"Pepper: High-bandwidth and Scalable Anonymous Broadcast with Cryptographic Privacy","abstract":"We present Pepper, a high-bandwidth anonymous broadcast protocol that provides cryptographic sender anonymity against global adversaries. Pepper builds on a two-server DC-net architecture but introduces three key innovations: a self-contained anonymous registration subprotocol using verifiable distributed point functions, support for batch messaging via distributed multi-point functions, and a lightweight access control mechanism based on secret-shared proofs. Unlike prior systems, Pepper eliminates the need for external dialing services and allows each broadcaster to send multiple messages per epoch with a single audit, significantly improving throughput for large data transfers. Our implementation demonstrates that Pepper achieves millisecond-level registration audits, scales efficiently to thousands of channels, and delivers 1.2--20$\\times$ higher effective messaging rates than state-of-the-art alternatives. Furthermore, Pepper is designed for practical deployment, with natural compatibility for co-deployment alongside Tor and federated social networks.","short_abstract":"We present Pepper, a high-bandwidth anonymous broadcast protocol that provides cryptographic sender anonymity against global adversaries. Pepper builds on a two-server DC-net architecture but introduces three key innovations: a self-contained anonymous registration subprotocol using verifiable distributed point functio...","url_abs":"https://arxiv.org/abs/2606.04411","url_pdf":"https://arxiv.org/pdf/2606.04411v1","authors":"[\"Chenghao Li\",\"Haoyuan Wang\",\"Xianghang Mi\"]","published":"2026-06-03T03:38:34Z","proceeding":"cs.CR","tasks":"[\"cs.CR\"]","methods":"[]","has_code":false}