ISDN Voice and Data encryptor
The Elcrodat 6-2 is a speech and data encryption device
telephone lines, developed by Rohde & Schwarz (R&S)
in München (Germany)
in the early 2000s. Is is the successor to the
Elcrovox series initially
developed by Siemens
and is approved for TOP SECRET information.
The Elcrodat series was developed by
ANT (later: Bosch)
in Backnang (Germany) before R&S took over.
The Elcrodat 6-2 allows voice data, fax messages and computer data
to be transmitted securely over standard ISDN telephone lines. It is
fully TEMPEST approved and is currently used by the German Government
(2014) for voice/data communication at the highest security level.
A minimum installation consists of two or more Elcrodat 6-2 devices, a management
station for certificate administration, a service station for remote
administration and a logging station for remote monitoring of the
encryption units. The image on the right shows a typical Elcrodat 6-2.
The unit is intended for desktop use and has a curved top surface
with all controls at the front. At the right is 12-button telephone
keypad plus 8 more control buttons. A large 4-line LCD screen at
the left is used for interaction with the user. At the bottom right
is a slot for a credit card-size authentication key. The Elcrodat 6-2
is the first encryption product approved for TOP SECRET that used
Public Key Encryption (PKE) for key distribution. New keys are negotionated
for each session.
- ELCRODAT 6-2S
Suitable for Euro-ISDN basic rate access (S0 bus/port).
Allows 2 data channels to be encrypted independently.
Maximum data rate 128 kbps.
- ELCRODAT 6-2M
Special version for Euro-ISDN primary rate access (S2M port).
Allows 30 data channels to be encrypted independently.
Maximum data rate 1920 kbps.
Operation of the Elcrodat 6-2 is rather straightforward and involves
only a few key-presses. All connections and indicators are at the front
as show in the image below. Interaction with the user is via the large
4-line LCD screen at the left and the rubber push-buttons at the right.
The Elcrodat 6-2 is protected by a chip card in combination with a
Personal Identification Number (PIN). For the encryption and decryption
of information a (secret) algoritm is used which is based
on a combination of asymmetrical and symmetrical encryption.
For key exhange and authentication, the system uses an asymmetrical
elliptical curve Public Key Encryption (PKE) technique. The actual data
is encrypted with a proprietary symmetrical encryption
algorithm developed by the
Bundesamt für Sicherheit in der Informationstechnik (BSI)
The Elcrodat 6-2 was approved by the for all security levels up to
(and including) TOP SECRET and is the main encryption device used
by the German prime minister Angela Merkel (2014). The device is also
used by NATO and is probably the first PKE device that was approved
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© Crypto Museum. Created: Wednesday 02 April 2014. Last changed: Sunday, 08 January 2023 - 17:15 CET.