Abstract: An asset management system and biometric security method is disclosed. The asset management system monitors the operational status of living and non-living assets in the field using sensors fitted to, or otherwise associated with, the asset. The operational status of the asset includes proof of life and indications as to the death or destruction. Electrocardiogram (ECG) signals from living assets may be enrolled in a biometric system at one or more heart rates to permit the identification or authentication of the living asset. ECG signal assessments may be used to increase system performance.