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Phone GSM R&S ← TopSec GSM
Smartphone voice encryptor
TopSec Mobile was a mobile encryption device,
introduced in 2008 by Rohde & Schwarz SIT 1 in München
(Munich, Germany). It enables
secure voice calls via
GSM and UMTS mobile networks,
using AES-256 encryption via a Bluetooth® connection.
It is the successor to the less secure TopSec GSM,
and is compatible with
iPhone, Android, Windows Phone and Windows PC.
It was certified by the BSI and NATO/SECAN for conversations up to the level
of VS-VERTRAULICH [4]. 2
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The product consists of two parts: a software-based VoIP client
for the mobile phone, and an external hardware-based encryption unit
that connects to the mobile phone via Bluetooth.
The VoIP client is available from R&S as a
free App for most smartphones and can also be used as a stand-alone
application for making normal (insecure) VoIP calls.
For secure conversations, the external TopSec Mobile device
is needed, as shown in the image on the right.
It uses its own microphone and earphones so that no
unencrypted voice data is handled by the mobile phone.
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Encryption and decryption are entirely handled by the device.
Keys are exchanged by means of a 384-bit ECC algorithm, whilst
AES-256 is used for the transmission of the actual voice data [2].
Two (mobile) parties can exchange secure calls, if they both have
installed a TopSec Mobile unit and the accompanying application (App).
In addition, secure calls to regular VoIP telephones can be made when the
external party has installed a TopSec Office Gateway (TSOG) on its PABX [G].
TopSec Mobile was certified by the
German Federal Office for Information Security (BSI)
and also by NATO/SECAN, for conversations up to the level of VS-VERTRAULICH [4].
TopSec Mobile was discontinued around 2024 and was succeeded by R&S ComSec,
a software-only solution, based on Apple indigo.
The latter has also been approved by the German BSI up to VS-NfD level 3 [7].
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Rohde & Schwarz SIT is a subsidary of Rohde & Schwarz Cybersecurity GmbH,
whicht itself is a subsidary of
Rohde & Schwarz International GmbH (RUSIG).
Both companies are located at the same premises.
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VS-VERTRAULICH = Vertrouwliche Verschlusssache — equivalent to CONFIDENTIAL [6].
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VS-NfD = Nur für den Dienstgebrauch (for official use only) - equivalent to RESTRICTED [7].
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Device Secure voice encryptor with Bluetooth Purpose Secure voice calls via GSM smartphone Model TopSec Mobile Manufacturer Rohde & Schwarz Year 2008 Country Germany Predecessor TopSec GSM Successor R&S ComSec - Apple indigo Bluetooth 2.0 Protocol V.32, V.110, TCP/IP Standby 100 hours Usage 4 hours Data transfer 3G, EDGE, Wi-Fi Data rate 9600 bit/s Controls Note Readout Liquid Crystal Display (LCD) Support (see below) Authentication 384-bit ECC key exchange Encryption 256-bit AES encryption Weight 85 grams
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© Crypto Museum. Created: Sunday 26 September 2021. Last changed: Thursday, 20 February 2025 - 11:47 CET.
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