Data Masking VBScript

Hello Experts,
 
I want to design a data masking vb script. My requirement is below:
I am having a text file with suppose 10 columns. Out of these 10 columns i want to mask 2 columns and generate the new text file. Here by masking i mean the original values in these 2 columns will change to some artificial values.
 
Can anyone help me with the logic/code. I am new to vbscript.
 
Thanks,
Anchit

First step to be a programmer: learn to read - e.g.
 
Show off your completed VBScript or code snippet here. Do not post Questions here, only completed scripts please. Script should be useful and created by you.

My bad :( i missed that 1...
Below is the script i am using:
============================
Dim arrFields
src =  "d:\src.txt"
tgt = "d:\tgt.txt"
Set objFileToRead = CreateObject("Scripting.FileSystemObject").OpenTextFile(src,1)
Set objFileToWrite = CreateObject("Scripting.FileSystemObject").OpenTextFile(tgt,2)
Dim strLine
do while not objFileToRead.AtEndOfStream
strLine = objFileToRead.ReadLine()
arrFields = Split(strLine, vbTab)
Wscript.Echo arrFields(2)
objFileToWrite.WriteLine(strline)
loop
objFileToRead.Close
Set objFileToRead = Nothing  
===========================
  
Here i want to modify the 3rd column arrFields(2), so the code
Wscript.Echo arrFields(2)
needs to be replaced with the code which can change the value of the column.
 
Could you please help?