Setting a file password

Hey there, I have to make a server between computers with freebsd for a school contest and yea. Well so far i have been able to use chmod o=r to restrict other users. I was wondering if there is a command to use password protect files or directories. Also, if there are some back doors to restrict stuff with the chmod o=r.(My server security and such is going to be tested by computer science graduates)

Thank ya and have a nice day,
Twist3dfear
 
ok thanks i'll try that. i just need to find way to restrict access from is without being the user and yea. I'm trying to figure out m0n0wall and PFsense to. I can't seem to get those working right
 
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