Voice spoofing attacks or ASV attacks are a relatively new threat to the biometric systems. At the moment, researchers highlight 4 main types of voice spoofing attacks: Impersonation, Replay, Speech Synthesis, and Voice Conversion. You can read more about Voice Anti-Spoofing on this Wiki - https://antispoofing.org/Voice_Anti-spoofing:_Origin,_Types_and_Preventive_Techniques.
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