One common theme running through the previous two suggestions is that they are dependent upon the ‘goodwill’ of the recipient, to keep the files safe. That is because as soon as the data’s decrypted it’s done, laid bare, and now outside your control.
The recipient is therefore free to do what he or she wants to with it, and share this decoded content with anybody they want (and remember, you’re always liable for any information being shared by your company) – meaning you go from having full control over the data to keeping your fingers crossed.
The good news however is that this doesn’t have to end the game. Instead, solutions already exist that allow you to revoke any file at any moment – irrespective of location and ‘platform’ (if it has been copied to a USB drive, or shared via tools like Box and OneDrive etc.).
In combination with data loss prevention (DLP) technology and classification, individual files can be encrypted automatically, thereby giving IT all the control they need to keep files safe across an extended and distributed working environment.