8 Send a Secure Text
Message
Before you can exchange
secure SMS messages with
a contact, you need to
complete a key exchange
for text messaging.
To initiate the key ex-
change, go to the Crypto-
Phone “Contacts” menu,
highlight the name
of your contact and
keep it pressed,
then select “Show/
Edit Details” from
the pop-up menu.
You can now ini-
tiate the key ex-
change by pressing
the “key exchange”
button.
For each key exchange,
five SMS messages will
be sent and received,
containing the public key
material.
After a key exchange is
completed, you will be
asked to verify the new
SMS key, either with a
secure phone call or by
other means.
Like in a secure
phone call, the six
letters of the cryp-
tographic finger-
print of your key
are shown on the
display.
Read out the three
letters that are
shown under “You
say” and verify that
