Clipping levels are used to differentiate between malicious attacks and normal users accidentally mistyping their passwords.
Password guessing may be detected by monitoring the failed login system logs. Note that most web-based attacks on passwords are of the password guessing variety, so web applications should be designed with this in mind from a detective and preventive standpoint. As we will learn in the next section: Password cracking refers to an offline technique in which the attacker has gained access to the password hashes or database. Password guessing is an online technique that involves attempting to authenticate a particular user to the system. Joshua Feldman, in CISSP Study Guide (Third Edition), 2016 Password Guessing
