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Nowadays, touchscreen mobile phones make up a larger and larger share in the mobile market. Users also often use their mobile phones (e.g., Android phones) to store personal and sensitive data. It is therefore important to safeguard mobile phones by authenticating legitimate users and detecting impostors. In this paper, we propose a novel user authentication scheme based on touch dynamics that uses a set of behavioral features related to touch dynamics for accurate user authentication. In particular, we construct and select 21 features that can be used for user authentication. To evaluate the performance of our scheme, we collect and analyze touch gesture data of 20 Android phone users by comparing several known machine learning classifiers. The experimental results show that a neural network classifier is well-suited to authenticate different users with an average error rate of about 7.8% for our …