Poster Abstract: A Secure P2P SIP System with SPAM Prevention

摘要

We have developed a P2P communication system that integrates security into design. Its key advantages are followingrn1. Although the system relies on a centralized authority to issue peer identities, its use afterward is decentralized, e.g., enabling secure communication in ad-hoc mode away from Internet.rn2. Incoming calls are filtered according to user's preference that can set the limit on hop count in friends' contact lists.