To secure classified data from getting misused, it is best to delete them completely after their required usage. However, deletion the of file is not sufficient, especially with the advent of powerful data recovery tools that are capable of searching data deleted even long back. Therefore, to delete files in a permanent manner what is required in more reliable and accurate. Complete file deletion as seen from the OS only empties the table entry in the file system, but bits of data remains written in the hard drive. Only when the hard disk space is overwritten by some other data is the previous data eliminated. So, the basic principle behind the permanent file deletion is to overwrite them with any random data. Software like Kernel File Shredder is built on this very concept to delete files and folders beyond the point of recovery. This application makes several passes of random or sequential bits of 0s and 1s t overwrite the data to be deleted from the system?s hard drive. Crypto algorithms like Depending on the sensitive nature of data, algorithms such as US Army AR380-19 (3 passes), Peter Gutmann (35 Passes), DoD 5220 + Peter Gutmann, and German VSITR (7 Passes) are used for this purpose. Kernel File Shredder removes every trace of data from the drive which is otherwise impossible to achieve even with disk formatting. This way, this tool can delete files and free disk space. For more information www.deletefile.org

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