NETWORK SECURITY METHOD AND NETWORK SECURITY SYSTEM
Disclosed are a network security method and a network security system. The method comprises steps: a third-party server, an application server, a mobile terminal and a client host being started and running respective read-only software; an application IC card transmitting an input user password to the application server; the application server and the client host respectively starting data packet filtering; the mobile terminal executing encryption and decryption computations of encrypted Internet communication of the client host; the client host directly logging in the application server and transmitting a user command to the application server; the mobile terminal and/or the application IC card confirming the user command with the application server; and the mobile terminal and/or a third-party IC card generating a user command digital signature. The system comprises the application IC card, the mobile terminal, the client host, the application server, the third-party IC card and the third-party server.