1. Introduction  
2. Synthetic Biometric Samples Generation  
3. The Threat: Inverse Biometrics Methods  
3.1. Knowledge Required: Template Format  
3.4. Knowledge Required: Feature Extraction  
4. Evaluating the Threat: Assessment of Inverse Biometric Methods  
4.1. The Evaluation Methodology  
4.2. Notes on the Evaluation Methodology  
4.3. Case Study on Iris Templates  
5. Mitigating the Threat: Countermeasures to Inversion Attacks  
6. Discussion: The Importance of Achieving Irreversibility  
7. Conclusions