Coding Theory Question, I think

Good Morning to you all

I am looking for a code that has the following properties:

Given some data (date, unique identifier etc etc) we need to map this data
to 16 digit strings. We need to be able to validate the strings as well.

I think I can manage the packing of the data and validation of the strings,
but I'm slightly stumped on how to encode everything into 16 digit strings.
Any pointers would be greatly appreciated.

To be brutally honest, I don't even know in what I'm looking for is
called ;)

regards,
Thinus
.