Future research in securing voice processing systems should focus on enhancing defense mechanisms, integrating multi-modal approaches, real-world deployment, and ethical considerations. This includes developing more robust algorithms and machine learning techniques to detect sophisticated attacks, combining audio, visual, and sensor data for improved accuracy, and conducting real-world evaluations to validate solutions. Additionally, addressing the unique security challenges of voice assistants and IoT devices is crucial, along with exploring ethical frameworks and guidelines to ensure responsible development and deployment of voice technologies.