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Template Distortion

Template distortion consists of applying either invertible or non invertible distortions to a biometric template. The distortion can be performed using either an invertible or a non invertible transform. In both cases the transform is chosen on the basis of a user key, which must be known when authentication is performed. In the case when an invertible transform is chosen, the whole security of the system relies on the key. On the contrary when non invertible transforms are used, even if the key is known by