tailieunhanh - Báo cáo hóa học: " Research Article Joint Source, Channel Coding, and Secrecy"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Joint Source, Channel Coding, and Secrecy | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2007 Article ID 79048 7 pages doi 2007 79048 Research Article Joint Source Channel Coding and Secrecy Enrico Magli Marco Grangetto and Gabriella Olmo Dipartimento di Elettronica Politecnico di Torino Corso Duca degli Abruzzi 24 10129 Torino Italy Correspondence should be addressed to Enrico Magli Received 1 March 2007 Accepted 13 August 2007 Recommended by Qibin Sun We introduce the concept of joint source coding channel coding and secrecy. Inparticular we propose two practical joint schemes the first one is based on error-correcting randomized arithmetic codes while the second one employs turbo codes with compression error protection and securization capabilities. We provide simulation results on ideal binary data showing that the proposed schemes achieve satisfactory performance they also eliminate the need for external compression and ciphering blocks with a significant potential computational advantage. Copyright 2007 Enrico Magli et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION AND BACKGROUND The design of modern multimedia communication systems is very challenging as the system must satisfy several contrasting requirements. On one hand because of the typically limited transmission bandwidth compression is necessary in order to serve the highest possible number of users. On the other hand compression typically renders the transmission very sensitive to errors or packet losses which can very easily decrease the quality perceived by the final users. In addition to these problems the ease of access and distribution of digital multimedia contents makes it possible to infringe the rights of the copyright owners by generating copies of the content which are exactly identical to