Masking data using SSIS

Masking data using SSIS

I have a table Employee and Employee_Mask and need to mask the Employee table by refering the Employee_Mask table.

Example :

source:

Employee

EmpID EmpName

1       AAA
2       BBB

Employee_Mask

EmpID EmpName
1      XXX
2      YYY

Output:

Employee
EmpID EmpName

1       XXX
2       YYY

Questions

1) This is sample records and have millions of records to mask which mean millions of records to update employee
table by referring employee_mask table.

2) what are the best ways to peform masking. I want to do it as bulk update in source table. Is Lookup tranformation will help in SSIs?

3) I dont have 2016 version so i cannot use new functions

4) what are the best ways to mask the data using SSIS ?