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Further information
Troubleshooting
If you experience problems when installing or using the AdderView Secure unit,
please check through this section for a possible solution. If your problem is not
listed here and you cannot resolve the issue, then please refer to the ‘Getting
assistance’ section.
No video from computer
• This is most likely to be associated with a mismatch between the host
computer’s video output and the DDC data held within the AdderView
Secure. Computers often need read the correct DDC data before they will
output a video signal.
Depending on your DDC connection policy (see
Video display (EDID)
information
for details), remember that the AdderView Secure will only
attempt to read the DDC data from your monitor when the AdderView
Secure is first powered on. To ensure that your monitor’s DDC data is read
and stored correctly, ensure that it is attached and powered on when you
switch on the AdderView Secure.
SECT 5
Summary of threats and solutions
This section provides a list of potential security threats that the AdderView
Secure might face during operation and the special steps that have been taken
to counteract them.
Threat
Solution
Microprocessor
malfunction or
unanticipated software
bugs causing data to flow
between ports.
Unidirectional data flow is enforced by
hardware “data diodes” so data isolation
doesn’t rely on software integrity.
Subversive snooping
by means of detecting
electromagnetic radiation
emitted from the
equipment.
Carefully shielded metal case with dual
shielding in critical areas.
Detection of signals
on one computer by
monitoring for crosstalk
(leakage) signals on
another computer.
No connection to sensitive analogue inputs
(such as computer microphone ports) are
provided. A very high level of crosstalk
separation is provided between signals
from different computers.
Malicious modification of
microprocessor software
causing data to leak
between ports.
Data isolation is assured by hardware and so
is not compromised by any changes to the
microprocessor software. Microprocessors
use one time programmable memory so
flash upgrades are not possible. Case uses
counter-sunk screws which can be protected
by tamper-evident seals.
Buffered data within a
keyboard or mouse is sent
to the wrong computer
after switchover.
Keyboard and mouse are powered down
and reset between each switchover to
ensure that all buffers are cleared out.
Data leakage by means
of monitoring conducted
emissions on mains power.
The power circuitry provides strong
protection against signal leakage via the
power cable.
