Terminal Communication Encryption4
Terminal Communication Encryption
The terminals by default use Blowfish Encryption on IP communications. This is necessary for the
security of Supervisor Net sites as they are often run on public networks, previously with pure serial
communications it was not as much of an issue. The 128 bit Blowfish Encryption is very secure.
The terminal will exchange an encryption key with the Supervisor Net Terminal Server when it first
makes a connection. The terminal will retry 3 times within a minute for the encryption key to be set,
whilst doing this a bar graph will appear on the display of the terminal indicating the progress.
Normally the swapping of encryption keys takes a couple of seconds at startup. A Terminal Menu
Option is provided to enable/disable encryption in situations where troubleshooting the
communications is required.
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