How to mask and unmask a creditcard number in oracle

Question

Hi,
Is there a way to mask a creditcard number from
"1234-5678-4321-8765" to "XXXX-XXXX-XXXX-XXXX" and unmask it back to readable format
using regular expressions in oracle?
Thanks in advance

Answer 1

yes, You can.
With the demonstration at the link I earlier provided; see the testing of Encryption as well as Decryption.
declare
    cursor c_cur is
        select uname, password from encryption;
begin
    delete encryption where 1 = 1;
    dbms_output.put_line('Starting Block...');
    insert into encryption values (1, 'purvesh', 'purvesh');
        dbms_output.put_line('Before Encryption');   
        for rec in c_cur loop
        dbms_output.put_line('UName :: ' || rec.uname || '; Password :: ' || rec.password);
        end loop;
        dbms_output.put_line('');
    user_security.update_user_password ('purvesh', 'purv');
        dbms_output.put_line('After Encryption');
        for rec in c_cur loop
        dbms_output.put_line('UName :: ' || rec.uname || '; Password :: ' || rec.password);
        end loop;
        dbms_output.put_line('');
dbms_output.put_line('Decryption!!!');
        for rec in c_cur loop
            dbms_output.put_line('Original Password for purvesh is ' || user_security.decrypt(rec.password ));
end loop;
    commit;
    dbms_output.put_line('End Block...');
end;
Starting Block...
Before Encryption
UName :: purvesh; Password :: purvesh
After Encryption
UName :: purvesh; Password :: 6ACBD318D9B3EFA0
Decryption!!!
Original Password for purvesh is purv
End Block...