SSL certificates to secure connections are nowadays an essential part of any system connected to the internet.
The root password is the final security barrier that protects a Linux system’s administrative account from unauthorized access. If the password is lost, it becomes impossible to administer the system and make configuration changes, so let’s look at different ways to recover it.
Input validation or data validation is a technique to test and verify all incoming data to make sure that it is in the right format. All applications should treat user input as untrusted by default and make sure that only the right kind of information is entered.