A study on minimizing packet loss impact by interleaving block coding in hiding voice information

• Main Authors: Sheng-hsun Lin, 林聖巡
• Other Authors: Tung-Ming Koo
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/82680696215642173800

碩士 === 雲林科技大學 === 資訊管理系碩士班 === 96 === According to ABI Research, Voice over Internet Protocol (VoIP) telephone service is extending its market from less than 38 million subscribers worldwide last year to expectedly over 267 million in 2012. These protocols related to VoIP proposed by IETF realize call signaling and media data delivery with SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol). They use TCP/UDP base as IP network and still inherit secure problems which may happen to traditional networks. Therefore, it is important to intensify VoIP security. When using VoIP to make business communications, how to intensify non-repudiation becomes an important secure issue. The availability of non-repudiation which is implemented by RTP communication has been mentioned by many studies. However, through information hiding technology of Error Correction to carry digital signature information could be failed in transition process because one block loss could exceed that Error Correction could recover. This research proposes a BPI (Block Package Interleaving) method which utilizes interleaving block code to share lost blocks so that it can minimize packet loss impact in hiding voice information with the technology of Error Correction. This method would not have impact on sound quality and need extra network bandwidth. It allows transited identification to recover efficiently.