APPARATUS AND METHOD FOR PERFORMING SECURE TRANSACTIONS WITH A DIGITAL DEVICE

Method to perform secure transactions with a digital device starts with microphone receiving signal generated by the digital device. Signal includes product information in inaudible portion of signal that identifies at least one product associated with a timeframe of signal. Trusted execution environment (TEE) generates start signal based on first sensor signal from first sensor that may be inertial sensor. Start signal is generated when first sensor signals indicate that user wishes to perform transactions with digital device. TEE verifies an origin of the product information to determine integrity of the origin and data. Display device displays purchasing information to a user that is based on the product information. TEE authenticates user based on second sensor signal from second sensor that may be biometrics sensor. TEE completes transaction to purchase at least one product by providing payment information associated with user. Other embodiments are also described.