Explanation:
A brute force attack is a trial-and-error method used to obtain information such as a user password or personal identification number (PIN). In a brute force attack, automated software is used to generate a large number of consecutive guesses as to the value of the desired data. Brute force attacks may be used by criminals to crack encrypted data, or by security analysts to test an organization’s network security. A brute force attack may also be referred to as brute force cracking. For example, a form of brute force attack known as a dictionary attack might try all the words in a dictionary. Other forms of brute force attack might try commonly-used passwords or combinations of letters and numbers.

The best defense against brute force attacks strong passwords. The following password policies will ensure that users have strong (difficult to guess) passwords:

F: Minimum password length. This policy specifies the minimum number of characters a password should have. For example: a minimum password length of 8 characters is regarded as good security practice.

D: Password complexity determines what characters a password should include. For example, you could require a password to contain uppercase and lowercase letters and numbers. This will ensure that passwords don’t consist of dictionary words which are easy to crack using brute force techniques.

A: Account lockout policy: This policy ensures that a user account is locked after a number of incorrect password entries. For example, you could specify that if a wrong password is entered three times, the account will be locked for a period of time or indefinitely until the account is unlocked by an administrator.