How can we restrict a user to modify particular columns of a table through sqlplus/sqlplusw or othe

Dear All,

I want to restrict modifications of specified columns of a table, through sqlplus/sqlplusw or sql developer or other utilities..i.e. they can be updated by my application only.

Whether such kind of restriction possible as a constraint ? if not what are the other ways to do the same?

so it won't allow any user to update such specified columns using other than my application..

Thanks

Ankit Shah