1. A method comprising: during a pre-enrollment phase collecting a plurality of samples of at least one biometric measure from an individual; saving the plurality of samples of the at least one biometric measure; prior to or during an enrollment phase, retrieving the plurality of samples of the at least one biometric measure collected from the individual; during the enrollment phase selecting valid samples of the at least one biometric measure from the plurality of samples collected from the individual, where the valid samples reflect statistically significant variations in the at least one biometric measure; generating an authentication model of the at least one biometric measure using the valid samples of the at least one biometric measure; and using the authentication model of the at least one biometric measure to authenticate a sample of the at least one biometric measure provided during an identity verification even by a person claiming to be the individual who provided the plurality of samples of the at least one biometric measure collected during the pre-enrollment phase.