User identification by the website

[kirill26477828]

Can you please write which "parameters" of the user's work in the Internet allow to identify the user by the website?

Explanation:
Under "parameters" I mean, for example (I only know a few but want to know everything):
> IP address;
> MAC address (each device it is unique);
> Profiles in social networks, other accounts (websites can see which accounts a user is logged in - am I right?)

By "identify" I mean the condition in which website with high probability can say that the user have already accessed the site before (e.g., different IP, but the MAC address is the same).

 

[DelJo63]

The typical means is to Set Cookie and then Get Cookie on subsequent access.

1. the website will be a constant
2. the users IP is not involved so it works anywhere
3. the presence of the cookie says definitely, this user+browser has been here before

(3) is interesting as you get unique cookies for each unique browser the user invokes.

The MAC is related to the physical machine {pc, apple, ipad, iphone}, but if multiple browsers are invoked, then (3) will make it appear as there are multiple first times.

Profiles in social networks, other accounts (websites can see which accounts a user is logged in - am I right?)

Not necessarily -- there's also a difference between being logged-in vs having visited the site. Read up on Cookie processing.