A method of tokenizing sensitive data from a terminal device includes receiving, a connection request comprising a hardware serial number associated with a terminal device and validating the hardware serial number associated with the terminal device. The method includes sending a command to a terminal device that causes the terminal device to display a prompt for sensitive data associated with a user interacting with the terminal device and receiving an encrypted data packet from the terminal device. The encrypted data packet includes the sensitive data. The method includes sending the encrypted data packet to a gateway system for tokenization, receiving a token that represents the sensitive data, and providing the token to the terminal device.