Unlocking principle of locking applet

The principle of temporary password unlocking of small programs is the role of timing.

This is very important, because only the code can be set to open once, but the door cannot be opened within a fixed time. There is also a timing function, and this logic is actually not complicated. Both parties have their own time, so it is enough to ensure the synchronization of time or the synchronization of built-in program settings. It is enough to have a time correction card or corresponding functions, so as to ensure that the time is the same when the passwords correspond.