One of the key applications for this system is for authenticating to medical devices worn on patients’ bodies. Devices such as wearable glucose monitors typically use wireless protocols such as Bluetooth to communicate, and those signals can be intercepted by attackers without much effort. The on-body transmission system can send credentials or encryption keys through the user’s body rather than over the air, making them less accessible to attackers.
Source: Your Body is a Wonderland–For Sending Passwords | On the Wire
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