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The digital forensics used in the corporate world primarily in relation to litigation involving computer- related evidence such as civil matters, breach of contract, breach of confidence, and so on, has recently been gaining a great deal of attention. In order to support the digital forensics in a stand-alone environment, we proposed a system named "Dig-Force (Digital Forensic System with Chaining Signature for Evidence)" that uses a USB device with a smart card function and a hysteresis signature based on digital signature technology. In the present paper, we discuss an application suitable for our system, and pro-pose a practical use such as surgical procedures where misconduct and mistakes are not permissible. In such a scene, not only data from a keyboard but also data from a camera are required. We also report on a program for the Dig-Force system that uses a function suitable for a camera application. Moreover, we show the result of an experiment that applies this program. The result shows the system is useful for keyboard as well as camera applications.

Development and Application of Digital Forensic Logging System for Data from a Keyboard and Camera