TReX User Manual v15.30 Firmware
Radio Link Encryption
Radio Links
The TReX can be configured to use industry leading AES 256-bit, block chained encryption
for all used radio data links. This means messaging between WTE TReX radios cannot be
intercepted without sharing of a key between devices.
A unique, non repeating timestamp is transmitted with every packet, ensuring that same
content messages are not repeated, and also allows for protection against replay attacks.
Historic messages with older time stamps can be rejected, protecting against malicious “record
and playback”.
In Telemetry and Modbus modes of operation outputs can be controlled with confidence, safely
and securely. When RS232 serial link options are selected, full encryption options are
available.
Secure Nationwide or Local Paging
One of the greatest shortcoming of public network paging is that unintended users with a
standard paging receiver can intercept and read messages. In some countries paging is still
used for emergency services and private information is transmitted. Some users still use
paging networks to control devices, where the interception of these messages may allow device
“hacking” and dangerous unintended behaviour.
The TReX can AES-256 encrypt standard paging messages and allow theses messages to be
supplied to nationwide paging services. Messages transmitted are now completely secure, only
able to be decrypted using a TReX receiver with a matching encryption key.
Emergency services can securely send encrypted messages across wide areas without the need
for changes to infrastructure in order to meet privacy requirements.
Secure applications may include:
•
Turning on fire station sirens/lights.
•
Sending messages to local regions for decrypted retransmission.
•
Enabling tsunami alarms across different parts of a country.
Note: In this application, the TReX may not need to be required to be used as a transmitter,
only as a receiver. The AES encrypted message is obtained through serial output from a TReX
unit, that is then supplied to an existing nationwide POCSAG or FLEX paging service
provider.
See RF
Security
for usage and configuration details.
© WTE Limited, 2022 – Christchurch New Zealand
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