PSTN/1i QSG V0.1E Page
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E. Switching from clear mode to secure mode while in a call
The CryptoPhone PSTN/1i allows you to switch from clear mode to secure mode
while in a call. This comes in handy when you determine that you need to discuss
sensitive or classified information while you are in the middle of a clear (unencrypted)
conversation. To switch from clear mode to secure mode while in a call, agree with
your partner verbally to switch to secure mode. Then do the following:
1.
Turn the key from horizontal to vertical position
to switch to secure mode.
Both sides need to switch to secure mode simultaneously by turning their
respective keys in order to allow the two devices to synchronize and start the key
setup procedure. If the two sides do not switch to secure mode simultaneously
within ca. two seconds, the connection will be terminated.
After you and your conversation partner have switched to secure mode, you will
hear the “ditt-dutt ditt-dutt” sound that signals to you that the “key setup”
procedure for the secure connection is in progress – just like you would when
making a secure call from the start. Once the key setup is completed you will hear
the familiar “Ping” sound and can start talking to your partner.
2.
Verify the authenticity of the key.
Please take a look at the telephone display
and read the three letters after “SAY:” to your partner and check the three letters
after “CHK:” to protect yourself agains the so-called “man-in-the-middle attack”.
3. Hang up the telephone receiver when you wish to finish the call.
Note that for security reasons, it is not possible to switch from secure mode back to
clear mode while in a call. To switch back to clear mode when in a secure call, you
must first finish the secure call.
F. Calling from the CryptoPhone PSTN/1 to mobile GSM CryptoPhones
GSMK CryptoPhones offer full interoperability between fixed-line and mobile devices.
The procedures for placing clear and secure calls from the CryptoPhone PSTN/1 to
mobile GSM CryptoPhones are the same as outlined above, however the following
conditions must be met:
In order to place a secure call
from a CryptoPhone PSTN/1 to a mobile GSM
CryptoPhone
(e.g. a GSMK CryptoPhone G10/G10i, a CryptoPhone model 100,
200, 220 or 300), you must obtain a separate data number for incoming V.32 data
calls from your mobile network operator. This number is also known as a "Data
Terminating Number". Please contact a customer service representative of your
mobile network operator of choice to learn how to order an incoming data number for
your specific GSM service contract. Once you have received such a separate data
number from your mobile network operator, only use this number (instead of the
regular voice number) to initiate a secure call.
Note that during a fixed-line to mobile connection from the CryptoPhone PSTN/1 to a
mobile GSM CryptoPhone, it is not possible to switch from clear mode to secure
mode or vice versa while in a call. This is due to the way the GSM network handles
incoming voice and data calls.
Содержание GSMK CryptoPhone PSTN/1i
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