Illuma Shield is a real-time voice authentication service for contact centers. Replacing traditional Q&A, Illuma Shield passively analyzes the caller’s voice over natural conversation and results in higher authentication accuracy in a fraction of the time. Illuma Shield differentiates over competitors with a privacy preserving implementation satisfying stringent security requirements of banking, insurance, benefits, and government call centers. The technology enhances security against fraudsters, elevates the user experience, and reduces operating costs.