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The authors propose a disk encryption method, called Secure Disk Mixed System (SDMS) in this paper, for data protection of disk storages such as USB ash memory, USB hard disk and CD/DVD. It is aimed to solve temporal and spatial limitation problems of existing disk encryption methods and to control security performance flexibly according to the security requirement of system. SDMS stores data by encrypting with different encryption key per sector and updates sector encryption keys each time data is written. Security performance of SDMS is analyzed at the end of the paper.
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