Secure File Delete in NAND-Based Storage
The existing secure file delete tool distorts secure contents by over-writing the randomly generated data many times, which decreases the recoverability of the secure contents. However, in NAND-based storages, the original secure contents are preserved even after performing the repetitive over-write requests, which is because of the out-of-place update of flash translation layer. In order to address the problem, this paper shows the method to implement the secure file delete as to the representative flash translation layer schemes. The result shows that the secure file delete can be implemented in the block mapping scheme or in the BAST scheme.