Hi all

I have a problem, in that i have a spreadsheet with a
column with a unique codes (next to the codes in the same
row are products), i now want to send this spreadsheet (or
part of it) to a customer but i DO NOT want them to see
the unique code (as it identifies who our supplier is), so
i want to make a temporary code, but as the customer will
mess around with the spreadsheet i don't just want to make
a code up, so i want to XOR (or use a cipher of somekind)
to change the code. this new code must be unique, and must
be able to change back to the original code.

I guess this includes macro's, but i ain't got a clue how
to use them!

Thanks in advance