Distinction between private key and public key -- Explanation of private key and public key

First of all, let's understand what public key and private key are ：

The function of public key and private key is to generate a ssh Public key and private key , Upload the public key to the other party ssh You can connect without password on the server .

Here is a demonstration of login without password ：

First of all we have kali A public key and private key are generated on the penetrating machine ：

First of all we have centos Generate a key on ：

Then we put the private key ：

Test into kali Realize password free connection on ：

Then I always know the user name , In fact, it is designed in the public key ：

There can also be permission problems during key connection , Use chmod Just empower .