"help" how to set file password in a shared dir

[sundarapandiyan natarajan]

dear sir,

my problem is -- Linux os

root person gave(shared) a few clients to access all.
but the clinets are feeling that some important files
should not be seen to all . the like to set password
to that files.

how it is possible. even can we create a tool to use
any type of client like our chmod. with setting
password permission.

or how to deny all users access for a few files.

regards,
sundar

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