Pda To Browse The Realization Of The Control System And Network Security Research

With the high-speed development of Internet, how to connect with Internet freely and rapidly is the major problem. PC had not been fit for the necessities because of its inconvenient for portability. People hope a portable but powerful device can replace the role of the PC. Now this idea has come to true owing to the development of IC and embedded system. This device is called PDA.This paper analyzes and investigating the definition, the components and the trends of PDA. And a Helio PDA browser system is designed and realized on the basis of customer's requirement. It's also deeply discussed in this thesis about the running environment, the software hierarchy of the Helio system. The author fulfilled the HTTP/1.0 protocol module and made a through analysis on the browser transmission module and other relative technologies. Further more, this thesis focuses on how to realize HTTP/1.0 protocol and the compatibility between HTTP 1.0 and HTTP/0.9. To achieve the high data-transfering performance, the author discusses on how to make fully use of transfering channel and provides a corresponding solution. An idea about the security transfer on network, which is based on the SSL3.0 protocol, is also put out at the end of this paper.