US Patent 9426139 Triggering a request for an authentication

The present disclosure relates to multifactor-based authentication systems. Multifactor authentication occurs during a communication session in response to detecting a trigger event, such as an anomalous condition. Historical metrics, such as performance metrics (e.g., rendering speeds), behavioral metrics (e.g., click-stream behavior), environmental metrics (e.g., noise), etc., can be used as a baseline to compare against metrics for a current communication session. An anomalous condition, such as a current session metric exceeding a threshold, can result in an authentication service transmitting a multifactor authentication request.