A smart card comprises: a processing circuit; a memory that contains a protected object; an activity detector that receives a signal that describes a planned activity of a person who is in physical possession of the smart card; and an activity analyzer that evaluates features of the planned activity. In response to the activity analyzer determining that a predefined risk associated with the planned activity exceeds a predetermined value, the activity analyzer: issues an instruction to the person who is in physical possession of the smart card to provide a biomarker to a biosensor that is physically contained within the smart card; and receives, from the biosensor, real-time biometric data for the person who is in physical possession of the smart card.