Abstract: A RFID tag (501), reader (502) and protocol allow a protected read operation in a two-step tag authentication with cipher-block cryptography. A challenge-response mechanism using a shared secret symmetric key (638) for tag authentication includes a challenge and information to read data from a tag's memory (637). Tag's response to the challenge-response mechanism includes the response to the reader's challenge and data from the tag's memory. A method embeds a protected write operation in a four-step reader authentication with cipher-block cryptography. The protocol allows a challenge-response mechanism using the shared secret symmetric key for reader authentication including a challenge and information to write data to the tag's memory. Reader's response to the challenge-response mechanism includes a response to the tag's challenge and data for writing to the tag's memory.

Abstract: Within the scope of the Internet of Things, this application helps to provide secure identification, both of users and of their vehicles, while also allowing to establish efficient communication with ad-hoc equipment installed in the environment in order to detect their presence, including those operating at high speed at the time of its passage, in the case of vehicles, for example. This would remove the need for a tag device (Win, Bluetooth, RFID or others) installed inside the vehicle to establish secure wireless detection, since this detection process would be performed through the cell phone itself, reducing infrastructure costs on both sides: at toll points and service payment systems as well as to the end customer.