Evaluation of a Risk-Based Management Method for Online Accounts

We propose a method for managing online accounts from the point of view of risk management. The proposed method reduces the risk of a personal information leakage, while permitting users to reuse passwords. We further propose a way to measure the risk of personal information leakage in order to estimate the risk impact. This proposed risk value is an index of the quantitative influence of leaked personal information. We evaluated the ability of the proposed method to minimize the risk of personal information leakage and the number of passwords that users can remember. In this evaluation, the α-group contained five passwords, and the β-group contains seven passwords. Thus, we conclude that the proposed method is useful as a whole.