Most of the authentication systems require the users to provide their credential for authentication purposes by providing their passwords or their biometric data. However, as long as the user remains active in the system, there is no mechanisms to verify whether the user who provides the credential is still in control of the device or not. Most mobile devices rely upon passwords and physical biometrics to authenticate users only when they start using the device. Active authentication based on analyzing the user's touch interaction could be a reasonable solution to verify that a legitimate user is still in control of a smartphone or tablet. In this research, an Artificial Immune System (AIS) is proposed to apply to continuously authenticate the users based on touch patterns. Our results show that AIS is able to actively authenticate 96.89% of the users correctly.
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