MCA-for-CAD: Multidimensional Continuous Authentication for Compromised Account Detection
摘要
Intent of malicious users to use social networks for malicious and inappropriate purposes has encouraged them to create fake accounts or compromise legitimate accounts. Latter is a crucial aspect as it involves risk to a user’s reputation as well as confidential data. Though researchers have proposed different techniques to deal with the detection of compromised accounts but they have analyzed it from a single perspective be it text, metadata, network, or time series. In this paper, a multidimensional user profiling-based technique has been proposed that models features from different dimensions and employs authorship verification procedure to detect the compromised accounts in online social networks. The task is to utilize a multidimensional feature set vector and assess which features and algorithm as well as what set of fine-tuned parameters help achieve better results. Both binary (two-class) and unary (one-class) classification perspectives have been taken into consideration for the detection of compromised accounts. For binary classification scenario, all the considered classifiers, namely, k-NN, RF, GB, SVM, and MLP attained an F-score above 96%. (SVM with rbf kernel outperformed others obtaining an average F-score of 97.38%). Likewise in Unary Classification, OCC-SVM (rbf kernel) outperformed other three unary classifiers (LOF, IF, and OCC-SVM) achieving an average F-score of 89.64% and Matthews correlation coefficient of 76.41%.