Friday, August 19, 2011

Secure deletion of files

Suppose you want to delete a file in a way that it become impossible to recover that. Normally when we delete a file the data is not actually destroyed only the index listing where the file is stored is destroyed. There a number of recovery tools that try to rebuild the index and recover the data.

On a busy system freed space may get used reused in second in that case data recovery become impossible, but suppose you want to be sure that after deletion none of method get data back. The best way is destroy the media which holding data, but in case of large capacity this is not practical solution. shred utility try to achieve similar affect. So shred command help in securely deleting files.