Patent ID: 8886316

Claim:
A method performed by a medical device, comprising: storing information used to derive a first probability distribution of obtaining a physiological value without physical contact with the living organism yielding designated errors and information used to derive a second probability distribution of a valid monitoring device obtaining the physiological value yielding the designated errors; receiving from a monitoring device a request for access to the medical device configured for implantation into a living organism from a monitoring device; measuring a physiological value of the living organism; performing a pairing protocol with the monitoring device, the pairing protocol comprising a secure channel set-up phase followed by an authentication phase; and permitting access by the monitoring device responsive to a successful pairing in accordance with the pairing protocol, the successful pairing being based at least in part on a determination that a physiological value supplied by the monitoring device substantially matches the measured physiological value; wherein the medical device performs the secure channel set-up phase before sending the measured physiological value to the monitoring device; wherein the measured physiological value sent to the monitoring device comprises a committed value, the committed value being bound to information determined based at least in part on the secure channel set-up phase; wherein the supplied physiological value and the measured physiological value each comprise two or more portions; wherein the determination that the supplied physiological value substantially matches the measured physiological value is based at least in part on: determining differences between corresponding ones of the two or more portions of the respective physiological values; and comparing said differences to an error threshold; and wherein the error threshold comprises different error rates for respective ones of the two or more portions.