Having passed through the turnstile, He Ao glanced at the card in his hand.
The card bore the likeness of a gaunt middle-aged man, resembling Joey by about fifty to sixty percent, complete with some dried, uncleaned bloodstains.
It was Joey's father's work card.
The principle behind these factory-customized work cards to open doors is that every card's internal chip has a code corresponding to the worker's ID number.
When the card is first made, a specialized authorization machine authorizes it, and only those with authorized cards can swipe through the access control turnstiles; this authorization has a maximum validity of one month.
And the turnstile itself is both an authorization and a verification machine.
Whenever the authorization expires, the turnstile reads the card's code and uploads the data to the cloud database to compare with the information of workers in the database.
