A Rotor includes a disk having a rim with an axial face, the rim defines a circumferential groove. The interchangeable frame portion may include a first temple, second temple, and linking portion between the first and second temples. A RFID reader attempting to identify and authenticate a tag within its range generates and transmits a random nonce to the RFID tag, which returns a first hash of its current pseudonym and counter, and a second hash that is a function of the secret key. The other end of the resistive memory element is connected to one of the first and second bit lines which is apart from the second sourcedrain region.