tailieunhanh - EURASIP Journal on Applied Signal Processing 2003:10, 1027–1042 c 2003 Hindawi Publishing

EURASIP Journal on Applied Signal Processing 2003:10, 1027–1042 c 2003 Hindawi Publishing Corporation On Securing Real-Time Speech Transmission over the Internet: An Experimental Study Alessandro Aldini Instituto di Scienze e Tecnologie dell’Informazione (STI), Universit` degli Studi di Urbino, 61029 Urbino, Italy a Email: aldini@ Marco Roccetti Dipartimento di Scienze dell’Informazione, Universit` di Bologna, 40127 Bologna, Italy a Email: roccetti@ Roberto Gorrieri Dipartimento di Scienze dell’Informazione, Universit` di Bologna, 40127 Bologna, Italy a Email: gorrieri@ Received 27 May 2002 and in revised form 3 January 2003 We analyze and compare several soft real-time applications designed for the secure transmission of packetized audio over the Internet. The main metrics. | EURASIP Journal onApplied Signal Processing 2003 10 1027-1042 2003 Hindawi Publishing Corporation On Securing Real-Time Speech Transmission over the Internet An Experimental Study Alessandro Aldini Instituto di Scienze e Tecnologie dell Informazione STI Universita degli Studi di Urbino 61029 Urbino Italy Email aldini@ Marco Roccetti Dipartimento di Scienze dell Informazione Universita di Bologna 40127 Bologna Italy Email roccetti@ Roberto Gorrieri Dipartimento di Scienze dell Informazione Universita di Bologna 40127 Bologna Italy Email gorrieri@. it Received 27 May 2002 and in revised form 3 January 2003 We analyze and compare several soft real-time applications designed for the secure transmission of packetized audio over the Internet. The main metrics we consider for the purposes of our analysis are i the computational load due to the coding decoding phases and ii the computational overhead of the encryption decryption activities carried out by the audio tools of interest. The main result we present is that an appropriate degree of security may be guaranteed to real-time audio communications at a negligible computational cost if the adopted security strategies are integrated together with the playout control mechanism incorporated in the audio tools. Keywords and phrases Internet multimedia applications real time security. 1. INTRODUCTION The Internet offers a best-effort service over public networks without security guarantees. Therefore the provision of secure real-time audio applications over wide area networks WAN like the Internet has to be carefully addressed. In particular the success of such applications depends strictly on the speech quality and the privacy guaranteed by the provided services which have to be perceived as sufficiently good by their users. Based on these considerations we concentrate our attention on the steps of the audio data flow pipeline depicted in Figure 1 which affect the performance and the security

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