The Design of Secure Acoustic Media Transmission and Secure Instant Messaging System

• Main Authors: Huang Chun-Chieh, 黃俊傑
• Other Authors: Tzone-Lih Hwang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/40471953440282890457

碩士 === 國立成功大學 === 資訊工程研究所 === 89 === With the trend of network, internet becomes one of the most important communication tools between people. Just like the telephone system, the development of internet affects our lives more and more deeply. Especially, the appearance of wide-band network makes the combination of multimedia and network possible. Nowadays, the pop communication software integrates instant messaging application and Internet Phone, so as to improve diversity of personal communication in internet. However, these instant messaging software transmits data arbitrarily in open network without any protection. In this thesis, we try to provide the instant messaging software with security based on the architecture of CA-PKI. The technology to transmit voice data through internet(voice over IP, VoIP) was researched widely recently. Considering the low cost and added service of the new technology, VoIP application has the potential to substitute the telephone system. In order to supply a secure voice communication, we try to use block cipher and stream cipher in acoustic media transmission software for user to find the most suitable way of protection in the VoIP application. Besides, we discuss some approaches to solve the problem of delay and jitter and to achieve the ideal quality of voice communication.