A total of 350 Chinese  enterprises are involved in the research, development and  production of products for the security of computer information  systems, and the number of their products exceeds 500, sources  said Tuesday.

   Sources with an ongoing fair on the Security of Computer  Information Systems said more varieties of products have been  developed in China and some of them have reached a level similar  to foreign-made items.

   The 3rd International Expo on the Security of Computer  Information Systems, approved by the Ministry of Public Security  and the Ministry of Science and Technology, is now being held in  Beijing.

   Some 60 manufacturers of information system security products  from the United States, Germany, the Republic of Korea, Singapore  and China are at the fair, exchanging views on network security  solutions, construction of IP security platforms and anti-virus  strategies in a wide-band environment.