WordPress Security Keys is a set of random variables that improve encryption of information stored in the user’s cookies. There are a total of four security keys: AUTH_KEY, SECURE_AUTH_KEY, LOGGED_IN_KEY, and NONCE_KEY.
These security keys makes it harder to crack your password. A non-encrypted password like “username” or “wordpress” can be easily broken, but a random, unpredictable, encrypted password such as “88a7da62429ba6ad3cb3c76a09641fc” takes years to come up with the right combination. You should use WordPress Security keys to increase security of your WordPress powered blogs or websites.
Self-hosted WordPress blogs does not have the Security Keys defined. You would need to add these yourself. It is a very simple and easy process, that you should be able to do as long as you know how to use FTP.
First, you would need to get your own unique Secret Key from this url(https://api.wordpress.org/secret-key/1.1/). WordPress has a random generator that can give you these secret keys. We recommend that you use that rather than inventing your own.
Second step is to modify your wp-config.php (file). You will find this file located in your WordPress root folder (the same folder where your wp-content and other folders are stored). In your wp-config.php file on line 45, you should see something like this:
Simply take your security key that we grabbed in step 1 and paste them accordingly in the following lines.
Save your wp-config.php file, and you are done. If you were logged into your WordPress admin panel, then you will be asked to log back in again.