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That can be avoided by a smart block scan the moment before the secure deletion happens. Depends on the filesystem modue implemented. /Mash
It is certainly possible to have a version of the rm command that overwrites the file upon deletion. That does not necessarily mean the erase is "secure". For examples, an SSD may perform wear leveling. The sectors on which the data was originally written may have since been relocated by the drive. Even after having overwritten the file upon delete, you can still dump the contents of the drive and may the data from the file on other sectors.
SSD wear leveling is just one example of problems with the operating system providing a guarantee to the user that data from the file no longer exists on the media. Taking a close look at all the block storage technologies supported by AIX, the operating system may not have the necessary visibilty and control to guarantee the user that data from file deleted is no longer being stored on the drive. It ends up getting a lot more complicated than simply overwriting the file.
OK, I managed to create a simple one - in a script - it will look into the certain file blocks/addresses located at any disk(s), and it will zero it then "rm" it
Lets work together?
Even in encrypted LV - the blocks/files/i-nodes location can be retrieved - it is all about the files/data addresses which are not yet encrypted.
I managed earlier to create an AIX tool to reover deleted files by only rading their location addresses. Similar of recovery softwares. So the idea of secure removal is firstly zero'ing the content of the file(s) (or blanking their locations) before removing their i-node names (un_link subroutine)!
I will work on that.
-Mash
AIX strategy in data at rest security is to build around capabilities in encrypted logical volume support as first introduced in AIX 7.2 technology level 5.
Please add Canadian Tire Corporation (Canada) to the list of customers requesting SFD. Thanks.
Creating a new RFE based on Community RFE #72640 in product IBM AIX.