A Lightweight Scheme for Securely and Reliably Locating SIP Users Lei Kong Vijay A. Balasubramaniyan Mustaque Ahamad.

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Presentation transcript:

A Lightweight Scheme for Securely and Reliably Locating SIP Users Lei Kong Vijay A. Balasubramaniyan Mustaque Ahamad

Introduction Mapping SIP address to contact address is an important function in VOIP systems Key requirements:  Integrity  Availability  Performance and scalability Our solution  Lightweight scheme to meet these requirements

SIP Trapezoid

Related Work SIPS DNS security extension Authentication Service Others

Our Approach Proxies have certificates User contact address signed with locally generated public key SIP proxies protect user public key exchange Balancing between two extremes: PGP/SSH End user certificates Other SIP message fields can also be protected

Using SIP Infrastructure to Protect User Public Key Exchange Proxy awareness of user public keys User public key is registered with local proxies User public key is completely managed by end points

Initial Session Setup

Session Setup after Public Key Exchange

High Availability Via Replication Byzantine fault model Replication schemes  For stateful proxy Consistency requirement  For stateless proxy Optimistic assumption and parallel session setup

Stateful Example

Stateless Example

Preliminary Evaluation

Conclusions and Future Work Lightweight approach for securing contact address and other SIP message fields Availability with Byzantine failure Preliminary performance results show better scalability Future performance study and SIP extension RFC proposal

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