Unique web browser identification ID for web control panel logins in Perl

Question

Do web browsers have a unique ID that can be passed on to Perl scripts? (Like a unique serial - like products that you buy in the shop have for example)

For instanc

Answer 1

Even we can use localstorage, sessionstorage and also cookies as well to implement this.. but wen these data s visble to user, so better to keep this encrypted