Abstract: Affected by hardware, environment, emotions and other factors, the keystrokes behaviors of users show diversity. The single keystroke center and tolerance radius of a single template can only describe basic behavior patterns of users. But in the actual situation, behavior patterns of users are diverse which can not fully described by the single template method. Multi-template joint decision updating method analyzes multiple template test results to determine the user behavior legitimacy. At the same time, it optimizes the template set by adjusting every template decision weight and updating the poorer conclusion template with better one. Compared with normal multi-template detection method, multi-template joint decision updating method reduces the error detection rate.

Key words: keystroke dynamics, template update, joint decision-making

摘要： 受硬件、环境、情绪等因素影响，用户的击键行为呈现多样性。单模板的单一击键中心和容忍半径只能描述用户的基本行为模式，而在实际情况中，用户行为模式多样，单模板方法检测范围有限。多模板联合决策更新方法利用多个模板检测结果，共同决策认证用户行为的合法性；同时调整模板的决策权重，用更接近用户中心的行为模板来替换检测结论较差的模板，优化模板集的构成。该方法比起普通的多模板检测方法，能够降低检测的错误率。

关键词: 击键动态, 模板更新, 联合决策