ter ‘Security, Storage and Handling’, we suggest you
keep the CryptoPhone with you at all times so that it is
under your permanent supervision. If the phone rings
or you need to place a call while the phone is charging,
you can leave it plugged in while operating the phone.
Standby
The GSMK CryptoPhone has four basic modes of op-
eration. It can be either completely switched off, in
‘standby mode’, active, or in ‘flight mode’. In normal
operation the CryptoPhone is in ‘standby mode’. In
standby mode, you can switch the device on at any time
by briefly pressing the left button right below the dis-
play and disabling the key lock.
Now the screen will light up. To put the GSMK Cryp-
toPhone G10 back in standby mode, simply wait until
the the screen goes dark. The GSMK CryptoPhone will
still receive incoming calls when it is in Standby mode.
In other words: standby mode will not disable the radio.
Flight Mode
It is not safe to enter an airplane, hospital or other no-
phone area with the GSMK CryptoPhone switched on
or in standby mode. To ensure the radio is off, you
need to enter ‘flight mode’. To enter flight mode, press
the On/Off button briefly and select “Flight Mode” in
CryptoPhone G10 User Manual
6
new attack methods. Since the CryptoPhone comes
with full published source code, the chances are much
higher for a flaw to be discovered and fixed quickly than
with any closed-source cryptographic product. Our ad-
visory board of distinguished cryptographers and secu-
rity researchers help us to identify and counter poten-
tial threats based on their intimate knowledge of the
latest academic research and emerging cryptanalysis
methods. In case a firmware update is needed for secu-
rity reasons, you will get notified either via the e-mail
address that you supplied when purchasing the Cryp-
toPhone online, or directly by the distributor.
If you receive a notice about an upcoming security up-
date, please verify it directly at our website
http://www.cryptophone.com/ to prevent attackers
from slipping you a malicious »update«. Please note
that we will describe the details of the update procedure
directly on the website.
The firmware update mechanism is cryptographically
secured using a 4096 bit public key signature system,
which ensures only signed CryptoPhone updates will
be accepted by your CryptoPhone.
If you receive suspicious communication regarding
CryptoPhone updates (such as an unannounced e-mail
with an update file as attachment), please inform us
CryptoPhone G10 User Manual
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