Morning Kumar,
In such a situation there isn't much that one can do anyways. If physical access to the appropriate hardware in question can't be secure intrusion will always be a possibility.
What is someone walked in with one of the numerous bootcd's(Knoppix) and booted through it edited your /etc/passwd file and then booted normally the machine so as to gain root access to your priveleged data????.
As we say in our mothertongue...."If someone has made up his/her mind to rob....so be it, they will always get around to figuring a way out".
Trevor
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