Kai realizes that someone hacked into his bank account by inputting thousands of different passwords until the correct password was entered. Which kind of attack has Kai experienced?

physical vulnerability assessment
brute force attack
phishing
denial of service

brute force attack

Kai has experienced a brute force attack.

Kai has experienced a brute force attack. This type of attack involves the hacker systematically trying different combinations of passwords until the correct one is found. It can be a time-consuming process, as the hacker may need to try thousands or even millions of different passwords to gain access. In this case, the hacker gained unauthorized access to Kai's bank account by trying various passwords until they found the correct one. To protect against brute force attacks, it's important to use strong and unique passwords, enable account lockouts after multiple failed login attempts, and use additional security measures like two-factor authentication.