Working process

Secure Voice for Series 60

Conversation encryption for Nokia Smartphones

Secure Voice for Series 60 and Symbian 3 is the encryption software for your mobile calls with Symbian smartphone. It encrypts your conversation on the fly, securing your sensitive information from eavesdropping and overhearing and grants you best audio quality.

Bewared quality: Secure Voice History

Secure Voice software predecessor was developed about seven years ago as a half-duplex solution. All these years it was widely used all around the world, and even got a security certificate of a Ministry of Defence after extensive security tests.

From 2008 to 2011 the full duplex of Secure Voice solution was available. This solution works also nowadays perfectly in many networks that have CSD data channel open.

In 2011 the release of Secure Voice 3G is made. Secure Voice 3G works over 3G, 2G and WiFi, and uses either the direct P2P connection, or connection via the communication server.

Secure Voice solution is a full duplex solution, which makes it more comfortable in use. The security algorithms have been enhanced and made even stronger as before. Now we use 1024 Bit RSA together with 4096 Diffie Hellmann encryption and AES 256 instead of ARC4 algorithms in order to provide the highest security.

Why is it secure to use Secure Voice

Secure Voice conversation is performed using encryption keys which are randomly generated and unique. Two mobiles exchange the keys and validate them, and only after that the voice encryption itself is possible. More than that: the exchanged keys are changing instantly, which allows decrypting the conversation only with the target mobile, but with no other device.

So there are two layers of protection:

  1. Unique keys exchange (keys are generated using a non-reversable mathematic function and encrypted with RSA or Diffie-Hellmann+RSA encryption algorithm)
  2. Conversation encryption (physically possible only after the level one with key validation was passed successfully). Voice encryption is made using modified ARC4 (older versions) or AES 256 Newer CSD and 3G version) algorithm with changeable keys encrypted with RSA (CSD version) or D-H (CSD and 3G version).

How Secure Voice Works

It is very easy to use Secure Voice. It has intuitive interface that allows you to make calls to manually dialed numbers or to the numbers from your address book - just as you are calling every day. The application can be started using one button of your Series 60 smartphone.

The application is auto started and listens to all incoming calls. If the encrypted call arrives, the application starts working.

Target audience

Secure Voice software is an enterprise and also end-user solution for those who care about data security. It is popular among wide range of politicians, government organisations, banks and business managers.

Preconditions for Secure Voice

There are no special preconditions, except that you have a data call to be enabled on your mobile.

Target devices:

Nokia Series 60 3rd edition:
Nokia 5320 XpressMusic*, Nokia 5730 XpressMusic*, Nokia 6110 Navigator*, Nokia 6120*, Nokia 6121*, Nokia 6124 Classic*, Nokia 6210 Navigator*, Nokia 6220 Classic*, Nokia 6290*, Nokia 6710 Navigator*

Nokia N Series: Nokia N71, Nokia N73, Nokia N76*, Nokia N77*, Nokia N78*, Nokia N79*, Nokia N80, Nokia N81, Nokia N81 8GB*, Nokia N82*, Nokia N85*, Nokia N86 8MP*, Nokia N93i*, Nokia N95*, Nokia N95 8GB*, Nokia N95-3 NAM*, Nokia N96*, Nokia N96-3*

Nokia E Series: Nokia E51*, Nokia E61, Nokia E61i*, Nokia E63*, Nokia E66*, Nokia E71*, Nokia E90*

Nokia S60 5th Edition:
Nokia 5228, Nokia 5230, Nokia 5230 Nuron, Nokia 5530 XpressMusic, Nokia 5233, Nokia 5235 Ovi Music Unlimited, Nokia 5250, Nokia 5800 XpressMusic, Nokia N97, Nokia N97 mini, Nokia X6

* Devices marked with asterisks have to be checked on compatibility with your GSM network first.


English, easy extendable for other languages.


Depends very much on the quantity of the licences purchased. Please request here: secure.voice@5pro-software.com

Distributors wanted

We always are happy to meet new distributors, so if you are interested in Secure Voice distribution, please contact us at secure.voice@5pro-software.com

Latest news
SV for iOS already available

The new 2012 starts with the release of the new version of Secure Voice for iOS. Now there is a possibility to hold secure voice calls on your iPhones, iPads and iPods. Request for a free demo right now.

Secure Voice 3G: P2P and server

We are happy to announce the new version of SV 3G that may connect both point-to-point and over the secure communication server. Beta testers are using this software in different networks now.

Need custom mobile software?
If you are interested in custom mobile development for Symbian, Windows Mobile, Blackberry, Android or iPhone, please contact us via romana.litkova @ 5pro-software.com

Need Custom Symbian Software?
5Pro is expert in custom Symbian development in all technology areas, including Nokia Partnering APIs and manufacturer approved Symbian Signing. Please contact us regarding your custom Symbian software right now!

Custom Blackberry Software
Need custom features in your Blackberry software? Contact 5Pro-Software and we will develop custom mobile client software as well as custom Blackberry server solution right for your requirements

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