1. Introduction 1.1. What is "desktop security"？ to manage the purview of the personal computers and to make sure the confidentiality, integrality, authenticity and non-deniability of the computer information by code technology. ? 1.2. Market analysis Hot market Information security products are quite hot at present, esp. in domestic market, which could keep soaring though the global IT industry slows down its pace. The security products market developed rapidly with the aid of the government last year, and the capacity of the information security market increases by over 100% each year. It is reported that the capacity of the domestic information security market reached RMB 0.9 billion or so in 1999, RMB 2 billion in 2000 and soared to about RMB 5 billion in 2001. According to a survey by 2850 companies in 12 countries, 56% enterprises increased investment in security in 2002. Puni Rajah, the vice president of IDC software and service research, said that the security products increased fastest and the global economic situation was likely to remain unstable, so the security product market in 2003 will keep on rising. In the exhibition of Chinese security industry in June 2002, Gou Zhongwen, vice minister of information industry office, said that the profits of Chinese information security industry would break through 10 billion RMB. Some professionals and institutions even forecasted that the capacity of Chinese information security market was expected to achieve 50 or 100 billion RMB during the following several years. The prosperous future of online security The online security product market of our country starts relatively early, and at present the strength of the domestic manufacturer can compare with that of foreign manufacturer. The foreign manufacturer has some advantages in hardware products, while the domestic manufacturer takes the initiative on the software product market. From the perspective of product structure, software of firewall and anti-virus software are still the main security products in the software market of online security, taking up 33.3% and 39.0% of the market share respectively in 2001. Information encrypted market, VPN and security certification markets, etc. are growing up, but by contrast with anti-virus software and firewall software, the share is relatively small. While the share will grow greatly for the trades as the finance, telecommunication, government, etc. are being information constructed, which have an increasing need for the whole solution of the online security. In China, the information technology develops fast and the network is used widely in almost every field, so the information security poses as the drawback to the network application and further service development, and it also makes the new high-tech industry with prosperous market prospects among the information industry. The number of the enterprises engaging on the developing and producing the computer information security system has increased rapidly to over 1000 in 2001 from 300 or so in 2000, i.e. every week there is a security firm established. And some famous Chinese IT manufacturers began to develop the security products as well. The market sale of the online security products reached RMB 4 billion in 2001. And the online security has become the "virus industry" that could bring great profits. Attach importance to desktop security The main problem of the information security industry is that the products are centere