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; deciding that an enrollment phase may be initiated upon detecting satisfaction of at least one predetermined criterion; informing the individual who provided the samples of the at least one biometric measure collected during the pre-enrollment phase that the individual may proceed with the enrollment phase; upon activities associated with the enrollment phase being initiated, discontinuing the pre-enrollment phase; prior to or during the 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, by a biometric measure authentication model generation apparatus, 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.