进入网络时代，保密工作难度大大提高。面对信息安全所面临的严峻形势，国家保密局、中保委相继出台信息安全要求，明确规定涉密计算机信息系统必须与国际互联网或其他公共信息网实行物理隔离。传统的双网隔离技术，是通过插入硬件隔离卡来实现的。但是这种硬件隔离卡只实现了硬盘的物理隔离，给双网间信息安全留下了漏洞
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