16 • Technical Information | Stelo Glucose Biosensor User Guide 101
Security measures
The Stelo Glucose Biosensor System uses the following interfaces and communication
protocols:
l
Transmitter: BLE.
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App: BLE to transmitter. TLS to Dexcom data platform using cellular data or Wi-Fi.
The Stelo Glucose Biosensor System is designed to transmit data between the
transmitter and designated display devices in accordance to the industry standard
Bluetooth Low Energy (BLE) protocols. It will not accept radio frequency (RF)
communications using any other protocol, including Bluetooth classic communication
protocols.
Don't pair your sensor over Bluetooth in public or populated areas. Bluetooth pairing
should be done in a private and safe location to reduce cyber risks such as
eavesdropping.
Critical function protection
In addition to the security provided by the BLE connection, communication between
the Stelo Glucose Biosensor transmitter and mobile applications is protected by
additional levels of security and safety mitigations using an encrypted and proprietary
data format. This format embeds various industry standard encryption protocols and
methods to protect data, verify data integrity, and to detect and prevent data
tampering.
The communication between the transmitter and the app uses PKI (Public Key
Infrastructure) to authenticate and verify that the transmitter is an authentic Dexcom
device.
Critical functionality is protected by run-time protections that detect security violations
and anomalies and take action to protect against an attack. In addition, the app
includes integrity verification to detect app modifications and malware injection that
could be used in an attack.
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