How I can mask a column in a table and still search on it, but not see it

 Folks,

We have a business need, where we need to mask (hide) a particular column in the table, but still be able to search on that column with a valid value.

So say, I have column A,B,C in a table called TEST, column B is varchar2

I need to be able to do run the following query:

select * from TEST where B='EG' ;  (WHERE  EG is a valid value), but not see the column B

or do

select * from TEST ; (not see the value of column

or do

select * from TEST where B like '%12%'; (not see the values in column