PrivateGSM
The software that protects your
conversations from prying ears.
Product facts
Version 9.0 - 2009

How it works
PrivateGSM protects your phone calls making them safe from
any attempt of listening or recording by any unauthorized
third party.
It works by a simple installation of software, which allows you
to place both protected and plain phone calls, depending on
the confidentiality of each communication.
1. A new key is generated for each call.
PrivateGSM is not just a simple tool for distorting the
conversation, but a sophisticated cryptographic system which
transforms the voice into a stream of encrypted data,
undecipherable by any third party and impossible to
understand or record.
To activate a safe phone call, both parties should have
PrivateGSM installed on their mobile, which then generates a
different protection key for every new phone call.
2. Each phone uses the cryptographic key
to encrypt the digital stream of the
conversation
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How to get it
PrivateGSM is offered in a service with an annual fee that Once installed, the receive-only version is ready
includes updates and technical support. to receive protected calls.
To start placing secure calls you only need to install our Voice streams, both inbound and outbound,
software on your cell phone, a very simple operation you can will be protected, but you will not be able
perform directly from our web site: to place secure calls, only receive them.
www.privategsm.com Outbound calls will be enabled as soon as you
enter the license code you receive at the time
or you can simply ask another PrivateGSM user of purchase.
to invite you from his / her phone.
PrivateGSM lets you send your contacts a free, receive-only Several payment options are available, both online
version, straight from the menu of the phone, and through your bank.
with the Invite function. Check out the available payment options
on the web site.
The saving is twofold:
• the user is not forced to buy a special cell phone PrivateGSM Trial
KHAMSA lets you try out the service for free
• the user can send anyone a Receive Only copy for a limited time period from the trial area from our web site
of the software for free, without having to buy www.privategsm.com
multiple licenses.
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The software in action
Secure calls Invitation
With PrivateGSM you can keep placing normal From the menu, you can forward the application
phone calls, and choose to secure others. in a receive-only version to your contacts, with
There are two ways to enable a secure call: whom you will be able to talk securely, without
the need for them to buy a license.
• Open the PrivateGSM menu
and choose a contact from your address book. The activation of the Receive Only version is
completely free and is without expiration.
• Without opening the application, type
the secure prefix (+801) followed by the
number to call. 1. The PrivateGSM menu.
Call cost
By doing this, PrivateGSM will detect the call The (+801) prefix results in no additional call
as secure and will start protection automatically: cost. Secure calls cost as much as CSD data calls,
which have rates comparable to voice calls in a
+4178661817x - standard call given plan, typically a time rate.
+801417866187x - secure call
2. Secure prefix call.
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Intended audience
PrivateGSM is a service designed for those who need to PrivateGSM is available in the following versions:
protect the confidentiality of their phone calls, in particular,
professional and executive customers. Professional: the full version, for those who
deal with important and confidential
Lawyers, accountants, but also executives, medical doctors information daily and need to keep a secure
and journalists, can now enjoy the ability to discuss the most network of contacts.
sensitive topics by telephone, which will create significant
reductions of costs and time. Receive-Only: for contacts of Professional
customers - those who only need to receive
Not only will professionals find a new comfort in avoiding secure calls.
onerous and expensive business trips, but also in the added
knowledge of a secured conversation. Trial: try-before-buy version, available
through the website www.privategsm.com
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Operative requirements
PrivateGSM requires a Symbian 9.x compatible phone
(currently the latest NOKIA models of the N and
E series - 35models in total).
Most operators require the activation of an additional data
number (fax/data line or CSD line).
For information on availability, please ask the Technical
Support of your operator.
An Internet data plan is not necessary.
The KHAMSA Customer Service is always available to assist
you in the installation and the initial activation.
For technical support you can visit the website
www.privategsm.com/support

Security
Philip Zimmermann is the top world expert in secure e-mail
and telephone communications.
KHAMSA brought Zimmermann’s ZRTP technology into
PrivateGSM, creating the ZRTP-S protocol.
Each call is secured by a session key which secures one
and only one given secure call.
The user is guaranteed that only himself and his
conversation partner can listen to the call.
Technical details
In a completely automated way, for each call, the device
uses the256bit elliptic curve Diffie-Hellman (ECDH) and
3072bit Diffe-Hellman methods to generate a one-time
AES256 session key.
In the unfortunate loss event of your phone, no one will be
able to access your calls, not even past ones made.
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See the privategsm.com website to download a trial version, or send the software to a friend.
You can try the full features of the product for free for 15 days.
www.privategsm.com
The present document cannot be used, modified, published or copied in any matter or means without prior consent of Khamsa SA.