TAILIEUCHUNG - CESNET Technical Report 13/2008 Impact of Network Security on Speech Quality

DoS attacks are particularly malicious because although they do not provide intruders with access to specific data, they “tie up” IS resources, preventing legitimate users from accessing applications. They are usually achieved by hackers sending large amounts of jumbled or otherwise unmanageable data to machines that are connected to corporate networks or the Internet. Even more malicious are Distributed Denial of Service (DDoS) attacks in which an attacker compromises multiple machines or hosts. According to the 2001 Computer Security Institute (CSI) and FBI “Computer Crime and Security Survey,” 38 percent of respondents detected DoS attacks, compared with 11 percent in 2000 | CESNET Technical Report 13 2008 Impact of Network Security on Speech Quality Miroslav Voznak Received Abstract dhis technical report deals with impact of secured network environment on speech quality. dhere are presented the results of the analyzing of voice over secure communication links based on TLS specially in OpenVPN solution. dhe using of secure network environments can affect a speech quality ere is the performance comparision of cipher alghorithms and description how the used security mechanisms influence the final R-factor. dhe presented results are based on experiments which have been performed in real IP network. Keywords TLS OpenVPN E-model 1 Introduction dhe security becomes a necessity of current corporate networks and two solutions appear either based on IPsec or TLS and therefore this topic has been chosen for our research in area of speech quality. dhe research regarding to Voice over IPsec has been performed at University of Milan 1 so I decided to focuse on TLS. Together with my colleagues from Milan we realized our real platform in order to understand how the voice services in IP network are affected by using the secure IP environment. dhe real performance test was implemented between VSB-Technical University of Ostrava and University degli studi of Milan. We pointed out the advantages and the disadvantages of the adopted security measure. We described two virtual testbed one developed using a traffic emulator and the second one based on a network simulator. Both the virtual environments were implemented in secure and insecure way. dhe executed measurements proved the obvious impact of some secure solutions on the voice quality the results has been published 2 but without an exact calculation. A method of calculation describing the overall impact of security on speech quality is published in this technical report the method is valid for TLS and has been tested with OpenVPN. Virtual Private Network VPN is a technology to construct a .

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