1. Secure VoIP

2. Outline Who? CUBE Members Why? Motivation What? Project Description How? Design and Implementation

3. Outline Who? CUBE Members Why? Motivation What? Project Description How? Design and Implementation

4. CUBE Hakan Nizamoğlu Yiğitalp Ertem Saim Güveloğlu Murat Toprak

5. Outline Who? CUBE Members Why? Motivation What? Project Description How? Design and Implementation

6. Costs Same operator fee : 0.47 TL / min Other operators : 0.64 TL / min Turk Telekom : 0.60 TL / min Text message fee : 0.30 TL / message

7. Who is on the phone?

8. Security Problem of both telephony and internet communication. No solution for PSTNs or GSMs What are the problems on internet? Man-in-the-middle attack Administrator as Big Brother

9. Outline Who? CUBE Members Why? Motivation What? Project Description How? Design and Implementation

10. Project Description Secure VoIP VoIP stands for “Voice over Internet Protocol” Aims low cost and secure communication No extra cost other than internet fee Data can be encrypted Targets from companies, military, government to home users

11. VoIP Usage

12. VoIP with external device

13. Project Description Secure VoIP VoIP stands for “Voice over Internet Protocol” Aims low cost and secure communication No extra cost other than internet fee Data can be encrypted Targets from companies, military, government to home users

14. Project Description Secure VoIP VoIP stands for “Voice over Internet Protocol” Aims low cost and secure communication No extra cost other than internet fee Data can be encrypted Targets from companies, military, government to home users

15. Outline Who? CUBE Members Why? Motivation What? Project Description How? Design and Implementation

16. FPGA Board Input Device : Microphone Output Device : Speaker Single board computer Encryption on board CPU Data Transfer over Ethernet

17. Asterisk PBX Software Short for “private branch exchange” Bridge between endpoints Routs the data Open Source Telephony Project used by small businesses, large businesses, call centers, carriers and governments

19. Technologies JAVA Asterisk Embedded Linux Kernel 2.6 FPGA Board SIP / RTP / UDP Protocols

20. References http://www.voip-info.org/wiki/view/What+is+VOIP http://www.economist.com/world/europe/displaystory.cfm?story_id=14921383 http://www.economist.com/world/europe/displaystory.cfm?story_id=14921383 http://www.turkcell.com.tr/bireysel/tarifeler/faturali/dig ertarifeler/tarifesaniye http://www.turkcell.com.tr/bireysel/tarifeler/faturali/dig ertarifeler/tarifesaniye “VoIP and Skype Security”, Simson L. Garfinkel “Network Protocols Handbook”, Javvin Technologies, INC

21. Thanks for your attention. You are welcome to ask questions.