How to implement protection of mifare cards from reading?

Question

Information Security

Good afternoon! Interested in the question of reading mifare cards
www.neftocard.ru/articles/mifare/vybiraem-kartu-do...
Judging by the article, for each card you can set a key for reading - writing. The key will be known only to the reader, respectively, you cannot remove data from the card by another reader. How is the process of obtaining information from the card by the reader? The reader sends the key to the card and, if the keys match, does the card give information? In this case, how to protect yourself from key interception at the moment of transferring it to the card? Or is the process of exchange of information going on in some other way?

Answer 1

And how do you protect yourself from reading the key when transferring to the reader - they will stupidly tear off the reader and here it is the key in the open.