Aiming to prevent the damage of information in computer from Internet and local network, the existing physical isolation technology is analyzed, specially for the situation, that the hard drive of the terminal equipment carried privileged information has to connect with Internet. Based on computer information security to identification, referenced of the lesson on access control and automotive antitheft technology, a new technical strategy is proposed, which combines system modules with physical isolated parts as one production by using identity cards, car alarm remote control as the certificate of authentication, to avoid remote and local aggression. The new strategy is the integration of existing mature technology, therefore it’s entirely feasible and worthy of promotion.

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