1. An implantable medical device, comprising: a wireless radio frequency digital communication radio transceiver; a physiological interface adapted to at least one of receive a physiological signal, produce a physiological stimulation, produce a motion or displacement, infuse a drug, and acquire a biological sample; and at least one programmable automated electronic processor configured to: communicate through the wireless radio frequency digital communication radio transceiver over an insecure physical channel with a relay device, and through the relay device to establish a cryptographically secure tunneling protocol communication with each of a plurality of different endpoints on a public network, the plurality of different endpoints each having a respective associated endpoint security certificate, to implement a public key infrastructure, respond to a request initiated from a respective one of the plurality of different endpoints, to open a cryptographically secure tunneling protocol communication session according to the public key infrastructure with the respective one of the plurality of different endpoints, the request being conveyed in at least one message received through the insecure physical channel by the wireless radio frequency digital communication radio transceiver, and verify the respective associated endpoint security certificate of the respective one of the plurality of different endpoints, with respect to at least a certificate revocation list, prior to transmitting private medical data or accepting received medical data as valid.