Keystroke Dynamics is a powerful technique which allows to detect and identify intruders in computer systems. In order to test keystroke data pattern matching and clustering algorithms, user data collection is a mandatory task. Si6 Labs developed a web application named k-pro ler with the purpose of collecting the typing rhythm data of volunteer users. This paper describes the experiment design criteria as well as the format of the collected data which will be used for Si6 projects and will be publicly available.