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Performance analysis: Securing SIP on multi-threaded/multi-core proxy server using public keys on Diffie-Hellman (DH)
David Samuel Bhatti1, Salbia Sidrat2, Shahzad Saleem3,4
1Department of Computer Science, University of Central Punjab, Lahore, Pakistan.
Plos One
|January 25, 2024
Summary
This study enhances Voice over IP (VoIP) security in local networks using smartphone technology and the Diffie-Hellman (DH) protocol for secure key exchange. It optimizes performance through multi-threading, improving response times and reducing call queues.
Area of Science:
- Computer Science
- Network Security
- Telecommunications Engineering
Background:
- The transition from Public Switched Telephone Network (PSTN) to Voice over Internet Protocol (VoIP) necessitates robust security for Session Initiation Protocol (SIP) communication.
- Existing security protocols for SIP often involve complex infrastructure and significant performance overhead, especially within local area networks (WLANs).
Purpose of the Study:
- To propose a novel security framework for smartphone-based VoIP communication over WLANs, leveraging the Diffie-Hellman (DH) protocol for secure key exchange.
- To optimize SIP performance by utilizing multi-threaded or multicore systems for handling concurrent calls, avoiding hardware-based SIP servers.
Main Methods:
- Implementation of a multi-threaded system where each thread runs on a separate core to manage concurrent VoIP calls.
- Integration of the Diffie-Hellman (DH) protocol for secure generation and exchange of cryptographic keys to safeguard SIP communication.
- Analysis of system performance using M/M/1 and M/M/c queuing models to evaluate response times and queue lengths with and without end-to-end security.
Main Results:
- A significant improvement in SIP response time was observed, decreasing from 20.23809 to 0.08070 minutes with the addition of threads.
- Increasing threads from one to seven reduced the queue length by four calls per minute.
- Secure media streaming and AES-based signaling introduced a minor 8 ms performance tradeoff, which is outweighed by the security benefits.
Conclusions:
- The proposed system effectively enhances the security of VoIP communication within WLANs using smartphone technology and DH key exchange.
- Multi-threading and multicore processing significantly improve the efficiency and scalability of SIP-based communication systems.
- The implemented security measures provide transparent end-to-end security, increasing user trust in VoIP systems.
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