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This option, as described by its name, is only valid for ISDN calls.
In particular, if such an option is selected, the THESEUS starts the encryption
procedure from the start of the ISDN connection. If the option is not selected, the
ISDN connection starts in unencrypted mode, however, you can activate
encryption at a later stage (during the connection, select the padlock
and
press OK).
Unprotected calls
From this drop down menu, you can choose how the THESEUS will behave if the
terminal with which a videoconference session is being negotiated is not
capable of supporting encrypted calls.
In detail:
Disconnect – The THESEUS does not allow connection with a remote terminal
that does not use encryption and therefore automatically disconnects.
Request Confirmation – During the session negotiation phase, the THESEUS
asks the user to confirm if they want to make an unprotected call.
Inform – The THESUS informs you that you are about to make an unprotected
connection by displaying a message on video.
State – The THESUS notifies you that you are about to make an unprotected call,
and when the connection is made, an opened padlock symbol will be displayed
on the status bar.
Key Length AES (only ISDN)
From this dropdown menu you can choose for ISDN connections only, from
three AES key lengths: 128 bits, 192 bits, and 256 bits.
Moreover, the "auto" option allows optimisation of the choice according to the
characteristics of the terminal in question.
Regarding an IP connection, the key length is always 128 bits.
DH Prime Number Key Length (ISDN only)
The protocol used requires the contemporaneous exchange of a prime number
and an AES private key between terminals.
For ISDN calls you can choose between two prime numbers:
High Security length 1024 bits.
Very High Security length 1536 bits.
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