ensure only my apps work

[Swapnil Jain]

Hi,

This is off track and not at all related to you, but i hope you could help. I have a very typical requirement. 
I have a ubuntu box and i want to ensure that only the applications, scripts, programs that i have installed should run on it, anybody else copying or installing something on it should not be able to execute. 

In other words i want to digitally sign the box or something and store that signage key in the boot loader. 
i googled a lot but could not find an appropriate solutions. i would appreciate it you could point me to something.

Thanks!
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Swapnil Jain ( http://swapnil-indore.blogspot.com/ )
Indore, India
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E-mail: swapnil at pisces.net.in
GTalk : swapnil at pisces.net.in
MSN: jswapnil at hotmail.com
Skype : sj1410
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