At such, it can be argued that the experimental results obtained closely resembled real world scenario.Another vital variable is the constraints that researchers imposed particularly in data collection phase. Experiments may www.selleckchem.com/products/BI6727-Volasertib.html be conducted entirely in a supervised environment with a strict protocol such as in [25]. Video clips of legitimate user login trials are prerecorded and later presented to the imposter in an attempt to imitate genuine user login during testing stage. Apart from that, experiments that involved additional customized hardware [21] or software library [33] will apparently be best to be performed under controlled laboratory environment. At such, the hassle and complexity of experimental deployment as well as the cost of implementation can be kept minimal.

It was also argued by [47] that one of the benefits of operating experiments under stringent protocol is to single out external factor from inflicting noise. As a result, primary experimental variables could be clearly evaluated [60]. However, there may be a concern that the result obtained under such control setting may not reflect real world scenario.On the contrary, experiments that did not impose restriction or unmonitored offered user comfort and flexibility that resembled realistic condition. As an example, the nature of the experiment conducted by [59] required the collection of typing pattern of user daily activity on a computer. Data collected by allowing user to use their preferential device is more desirable than requiring user to work on an entirely unfamiliar device.

Since lacking of constraints, the quality of data collected could be distorted or tempered with. Perhaps these might be the reasons why most research works perform under close administration, more than double of the amount of those uncontrolled.3.3. Development PlatformSince the most common user interaction involving text and numerical input is through a personal computer, researchers who were working on keystroke dynamics are almost all based on local computer platform. Before the 21st century, keystroke dynamics experiment prototype was developed on operating system (OS) platform using third-generation programming language (3GL) such as FORTRAN [61] and Turbo Pascal [1]. Later when Microsoft products dominate most operating system, an experimental prototype was built on top of MS DOS [62] and windows environment [43] by using languages such as C++ [63] and Visual Basic [64]. Owing to the pace of internet development in the last decade, Anacetrapib experimental platform has been shifted to the web-based environment [15] with web programming tools such as JavaScript [65], Java Applet [66], and Flash [67].