机载信息系统存储安全问题研究

Storage security solution to air-borne information system

机载信息系统由于它特殊的应用环境对信息安全有着特殊的要求,一方面要保障存储信息的绝对安全可靠,另一方面又必须考虑在某些紧急情况下,机载信息系统中信息的绝对保密。在存储信息绝对安全可靠方面,为了防止存储介质损坏,采用损耗平衡算法平均使用存储介质所有存储单元;损毁块管理算法用以保证损坏的存储单元不再被使用;而错误纠正与检测算法保证了存储单元的读写操作万无一失;掉电管理保护防止了意外断电造成的数据丢失或损坏。对于机载信息系统中绝密信息,紧急情况下将进行数据擦除的方法从而保证绝密信息不落入敌手,根据机载信息的绝密程度和擦除数据的时间要求选择Basic Purge、Rapid Purge、MilPure和Intelligent Destructive Purge4种数据擦除方式。

Air-borne information system has special requirements due to the special environment it applies. The storage of the information both demands reliability and confidential under urgent situations. On the aspect of information storage, Wear-leveling algorithm is developed assuring the equal usage of all storage units in the storage media so as to prevent the media from damaging; BBM （Bad Block Management） algorithm is developed to avoid further use of damaged storage unit; ECC （Error Checking and Correcting） is developed to guarantee the reading/writing operation of the storage unit and Power Fail Safeguard is developed to protect the data from unprecedented failure of the power system. On the aspect of keeping confidential information, a wiping-out procedure will be undergone when emergency approaches isolating the information from rivals and enemies. According to the confidential degree and wiping-out time requirements, 4 modes which called Basic Purge,Rapid Purge,MilPure and Intelligent Destructive Purge are available for the purpose.