Boomerang - Metadata-Private Messaging under Hardware Trust

Explore a conference talk on Boomerang, an innovative metadata-private messaging system that leverages secure enclaves to achieve a balance between security, performance, and trust assumptions. Learn how this alternative approach addresses the challenges of protecting communication metadata in end-to-end encrypted messaging systems. Discover the carefully tailored oblivious techniques employed by Boomerang, including message shuffling, workload distribution, and proactive patching of communication patterns. Understand how this system achieves low latency, horizontal scalability, and cryptographic security without incurring prohibitive costs. Gain insights into Boomerang's performance, which achieves a 99th percentile latency of 7.76 seconds for 220 clients using 32 machines. Consider the potential impact of this solution on the current landscape of metadata-private messaging designs and its implications for large-scale deployment.