Abstract: Over the last decade biometric person authentication has revolutionised our approach to personal identification and has come to play an essential role in safeguarding personal, national and global security. It is well-known, however, that biometric systems can be "spoofed", i.e. intentionally fooled by impostors. Efforts to develop spoofing countermeasures are under way across the various biometrics communities (http://www.tabularasa-euproject.org/). However, research in automatic speaker verification (ASV) is far less advanced in this aspect in comparison to physical biometrics such as fingerprint, face and iris recognition...

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