Implantable medical devices, such as pacemakers, can be hacked and researchers at Rice University have developed a secure way to keep out the hackers. Their technology uses a patient’s own heartbeat as a password. The new system, called Heart-to-Heart, would require someone wanting access to the IMD to actually touch the patient; then the internal and external devices would use an EKG to identify the heartbeat as a password and a handshake completes the process to gain access. Since the heartbeat is different every second the password is different each time. And already implanted IMDs could be updated to use this technology.