Defeating authentication follows the method–opportunity–motive paradigm described in Chapter 1. Discuss how these three factors apply to an attack on authentication.
What will be an ideal response?
Method: There are many potential methods to defeating authentication: password guessing, brute-?force attacks, biometric forgery, identity theft, guessing answers to password reset questions, etc.
Opportunity: Opportunity changes depending on a variety of factors, such as how accessible the system is, how it behaves when a user fails to authenticate a number of times, what types of passwords it allows, and how the system resets lost passwords.
Motive: This is typically something of value the attacker might gain from defeating the authentication. Without a motive, an attacker would have no reason to execute the attack and certainly not to pour expensive resources into it.
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