Medical devices like insulin-delivery systems operate wirelessly and are easily accessible to devices, but they are also vulnerable to hackers either eavesdropping or interfering with functionality. So researchers at Purdue and Princeton universities have built a monitor that could protect such devices.
Dubbed MedMon, the medical monitor can be worn as a necklace or integrated with a cell phone. Like a firewall, it monitors all communications with the implants and looks for anomalies that represent potentially malicious activity. The firewall raises an alarm and jams the suspicious communications.
Source: Purdue University Center for Implantable Devices, Weldon School of Biomedical Engineering, http://engineering.purdue.edu/CID.