arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.09337cs.CR
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基于实例击键动力学的快速自由文本认证

Fast Free-text Authentication via Instance-based Keystroke Dynamics

Blaine Ayotte, Mahesh K. Banavar, Daqing Hou, Stephanie Schuckers

摘要:

击键动力学研究用户通过键盘输入文本的方式。有能力区分用户,打字行为可以不引人注目地形成行为生物识别系统的一个组成部分,以提高现有的帐户安全性。自由文本数据上的击键动力学系统以前需要500个或更多字符才能达到合理的性能。在本文中,我们提出了一种新的基于实例的图比较算法,称为基于实例的尾区密度(ITAD)度量,以减少认证用户所需的标记数。此外,在计算机动力学文献中常用的特征,如专题论文和双字母表,都被发现在告知谁在打字方面是有用的。使用随机森林分类器确定这些特征用于认证的有用性,并在两个公开可用的数据集上进行验证。来自各个特征的分数被融合以形成单个匹配分数。使用融合的匹配分数和ITAD度量,我们在Clarkson II数据集上实现了100和200个测试有向图的相等出错率(EER),分别为9.7%和7.8%,比最先进的35.3%和15.3%有所提高。

英文摘要:

Keystroke dynamics study the way in which users input text via their keyboards. Having the ability to differentiate users, typing behaviors can unobtrusively form a component of a behavioral biometric recognition system to improve existing account security. Keystroke dynamics systems on free-text data have previously required 500 or more characters to achieve reasonable performance. In this paper, we propose a novel instance-based graph comparison algorithm called the instance-based tail area density (ITAD) metric to reduce the number of keystrokes required to authenticate users. Additionally, commonly used features in the keystroke dynamics literature, such as monographs and digraphs, are all found to be useful in informing who is typing. The usefulness of these features for authentication is determined using a random forest classifier and validated across two publicly available datasets. Scores from the individual features are fused to form a single matching score. With the fused matching score and our ITAD metric, we achieve equal error rates (EERs) for 100 and 200 testing digraphs of 9.7% and 7.8% for the Clarkson II dataset, improving upon state-of-the-art of 35.3% and 15.3%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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