1. A system for validating an active terminal session, comprising: an idle session timer; at least one analyzer in communication with an authorized terminal device and configured to analyze input from the terminal device and ascertain human-like behavior during the active terminal session and responsively determine whether the terminal device input is likely from a human user or from an automaton; the at least one analyzer further configured to: terminate the session, generate a time-out warning to the user or present a challenge to the user in response to a determination that the terminal device input is likely from an automaton; manipulate the idle session timer in response to a determination that the terminal device input is likely from a human user or to the user passing the challenge; or terminate the session in response the user failing the challenge.