Question about world read permissions on system level files

[Biyala, Urvi]

All,

I need to trim the world read permissions from the system sensitive files. I know that it would be safe to trim the permissions from many of the configuration files in /etc. But I was not sure if I could safely tighten the permissions form other system files. Does any one know of any documentation on this. Or can any one tell me if it is safe to trim world read permissions from the system files.

Thanks in advance,
Urvi