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cisco certification jobs salary.Keystroke strength/pattern.Systems with feature authentication turned on have the disadvantage of being less accurate in performing authentication. Let's say,a system that verifies signature strength changes would first have the user sign and then verify the user's identity by comparing the strength change pattern of the user's signature with what the system has recorded. Since a person may sign in a slightly different way each time, the system should be designed to allow the user to pass the verification even if the strength change pattern of the user's signature is not exactly the same as the one recorded by the system. However, such a "degree of freedom" should not be so high as to prevent unauthorized users who imitate the signature from "getting through".Because biometric systems are not accurate enough to perform authentication, two types of errors can occur.Type I error: Also known as "falserejection", a valid user who should have been authenticated is rejected by the system.Type II errors: Also known as "falseacceptance", when a user who should not have passed authentication (for example, an attacker trying to impersonate a valid user) is accepted by the system.Crossover Error Rate (CER), also known as Equal Error Rate (EER), is the point at which the RateofFalseRejection (FRR) and the RateofFalseAcceptance (FAR) are equal.The point at which the RateofFalseRejection (FRR) is equal to the RateofFalseAcceptance (FAR).This is often considered an indicator of the accuracy (and quality) of a biometric system.The three authentication methods presented in this section, along with their brief descriptions and examples, are shown in Table 4-2. -... Table 4-2 Authentication MethodsAuthentication method Description Example