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.

翻译：摘要：本文提出Pepper，一种高带宽匿名广播协议，能为广播者提供对抗全局敌手的密码学发送方匿名性。Pepper基于双服务器DC-net架构，但引入三项关键创新：利用可验证分布式点函数的自包含匿名注册子协议、通过分布式多点函数支持的批量消息处理、以及基于秘密共享证明的轻量级访问控制机制。与现有系统不同，Pepper无需外部拨号服务，并允许每个广播者在单次审计周期内发送多条消息，显著提升大数据传输的吞吐量。实验表明，Pepper可实现毫秒级注册审计、高效扩展至数千个频道，有效消息传输速率比现有最优方案提升1.2-20倍。此外，Pepper专为实际部署设计，具备与Tor及联邦社交网络的天然兼容性，支持协同部署。