Assign ID number from list to survey participants

I have a similar request to the above. Is it possible to assign a unique code to a respondent from a list generated in Excel when the respondent answers a specific question?

Upload these as contacts to your directory. Then either generate custom links for each respondent or use an authenticator to assing them the required ID based on their inputs.

Thanks Ahmed for your response.
I should have stated that the survey is conducted through a generic link so we don't have a contact list in the directory. Also, not every respondent will receive a code, only those that answer a question in a particularly way (e.g. Q2 is 'Yes')

In that case, you could either look at an assignment post the data collection phase or calling a webservice to provide one of the codes that you have.