An experimental addition to UNIX allows a user to connect a watch-dog program to a file.The watchdog is invoked whenever a program requests access to the file.The watchdog then either grants or denies access to the file.Discuss two pros and two cons of using watchdogs for security.
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The watchdog program becomes the primary security mechanism for file access.Because of this we find its primary benefits and detractions.A benefit of this approach is that you have a centralized mechanism for controlling access to a file- the watchdog program.By ensuring the watchdog program has sufficient security techniques,you are assured of having secure access to the file.However,this is also the primary negative of this approach as well- the watchdog program becomes the bottleneck.If the watchdog program is not properly implemented (i.e.it has a security hole),there are no other backup mechanisms for file protection.