OCTAVE delivers an access control platform through a trusted voice authentication service for use in data-sensitive and mission-critical applications in actual business/commercial environments. OCTAVE relieves users from the inconvenience of textual passwords and reduces the economic and practical burden on service providers regarding password loss and recovery. The OCTAVE platform is based on state-of-the-art speaker verification technologies that offer effective robustness against environmental variability and various types of spoofing, thanks to detection of fraudsters impersonating other users.