Pirates: Anonymous Group Calls Over Fully Untrusted Infrastructure
arxiv(2024)
摘要
Anonymous metadata-private voice call protocols suffer from high delays and
so far cannot provide group call functionality. Anonymization inherently yields
delay penalties, and scaling signalling and communication to groups of users
exacerbates this situation. Our protocol Pirates employs PIR, improves
parallelization and signalling, and is the first group voice call protocol that
guarantees the strong anonymity notion of communication unobservability.
Implementing and measuring a prototype, we show that Pirates with a single
server can support group calls with three group members from an 11 concurrent
users with mouth-to-ear latency below 365ms, meeting minimum ITU requirements
as the first anonymous voice call system. Increasing the number of servers
enables bigger group sizes and more participants.
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