A Chinese Continuous Keystroke Authentication Method Using Cognitive Factors

Everyone has different biometrics, so personal biometrics can be applied to authentication. Moreover, the biological characteristics are not easy to be copied, and the user does not need to memorize and does not need to carry extra things. Biometrics can be divided into two types: physiological characteristics and behavioral characteristics. This study belongs to behavioral characteristics and adopts dynamic keystroke behavior to verify the identity. Many dynamic keystroke authentication methods have been proposed, but most of them are only suitable for English. Only very small numbers of keystroke authentication research are designed for other language (such as Chinese). This study focuses on how to use Chinese keystrokes for continuous authentication. Different persons have different vocabulary usages. The main influence comes from different exposure to different “word frequency” during the learning process. “Word frequency” is the frequency at which words appear in a person's life. Frequency varies due to the individual's life experience. Therefore, if the user frequently enters a word, the user will be more familiar with the input of the word, so the familiarity will be related to the past learning cognition. This study treats this familiarity as a cognitive factor, and explores the impact of cognitive factors on identity verification in Chinese language. This study compares the keystroke authentication with cognitive factors and the keystroke authentication without considering cognitive factors. It is found that the former is more accurate than the latter.