Science and Development Network (SciDev.Net)
Recently, various kinds of data such as pictures, personal videos, contacting information, social security number, and so on are digitalized and stored in computing devices, which results in raising security concerns. For example, the authors need to guarantee that the files are completely removed by the deletion operation, which is called secure file deletion. There are lots of secure file deletion tools for hard disk drives. They distort the original files by over-writing them with randomly generated data repeatedly. However, these secure file deletion tools may not work properly in the NAND-based block devices because of the existence of Flash Translation Layer (FTL).