Performance of keystroke dynamics when allowing typing corrections

Keystroke Dynamics can be used to strengthen the user-name/password authentication system because it will not only consider the value of the password, but also how the password was typed. Keystroke Dynamics systems so far only accept passwords that are typed completely correct, i.e. without any corrections during the typing. The reason for this is that corrections during the typing result in missing features in the collected Keystroke Dynamics information. In this paper we will show however that the performance of the keystroke dynamics system is not influenced if indeed corrections are allowed during the typing of a password. We have investigated various solutions to handle these missing features and investigated how much the performance de-creases. We found that we can handle these missing features without any loss of performance, meaning that the algorithmic performance of the system does not decrease. In fact when allowing corrections, the system performance will highly increase due to the fact that there are no failures to capture.