Asking for the absolute security of one's personal data on the internet is like asking never to be infected with some... disease in one's life.

Seventy years and something of extensive scientific research have shown that all systems (living organisms and machines) are at the same time closed (have some of their own functions) and open (to external interferences from the environment).
This inviolable law, according to scientists, is what makes it impossible to fully secure and protect a system from all kinds of external dangers.
The same, in general terms, was said during the recent "Technology and Communication Experts Conference", which took place in Cologne (February 10-14), on the topic of internet security.
As was said at the Conference, today's Internet users are more aware and informed than in the past. Many are suspicious when they receive "spam" messages, or know what "viruses" are and how to avoid them. However, this means absolutely nothing: as Ben Williams from the NCC Group pointed out, along with the development of Internet technology, hacker attack methods are also evolving. He himself, in order to increase Internet security, puts himself in the shoes of hackers, trying to imitate them.
Specifically, as reported by Deutsche Welle, he said the following:
“As a hacker, I need to know what program is installed on the server and what its email address is… In this way, by sending fake emails to random addresses, I can break into a foreign internal mail server and extract information. The responses I receive from the randomly selected email addresses reveal a lot about the electronic identity of the attacked computers… In this way, I can learn the addresses of the firewalls, the filters used in the emails, and so on. I can understand which specific products are involved and which version is installed. All this data helps me plan my attack… Another way to access personal information is through links sent with a supposedly personal email to a specific recipient. This way, many people click on this dangerous website. However, this page is fake. By clicking there, a hacker obtains information about the filters used by that server.".
How much clearer can it get?
