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ELCRO
Voice, telegraphy and data encryptors

ELCRO was a family of encryption/decryption devices, initially developed by Siemens in München (Munich, Germany), for a wide variety of applications, including voice, data, facsimile and tele­printer traffic. Development and sales of the devices was later taken over by ANT and eventually by Rohde & Schwarz (R&S), who continues to develop and market the devices to this day (2018).

ELCROVOX
ELCROTEL
ELCRODAT
ELCROBIT
ELCROMUX
  
ELCRO family
In the ELCRO family, each type of device has a generic name that consists of the word ELCRO with a three-letter suffix appended at the end, such as VOX or TEL. The name can be written in upper case (e.g. ELCROVOX 1/3) or in lower case (e.g. Elcrovox 1/3) The following types are known:

  • Narrow-band voice encryption
  • Telegraphy (telex) encryption
  • Data encryption (used in AUTOKO communication system)
  • ISDN voice and data encryption (up to 64 kbps)
  • Trunk encryption (multiplex) up to 2 Mbps
ELCROVOX
ELCROVOX was a series of narrow-band speech encryptors used over radio or via telephone (land) lines. Elcrovox 1/3 was a military voice encryptor that used a proprietary Siemens encryption algorithm. Keys were loaded into the device by means of a short piece of punched paper tape.

It was succeeded by the much smaller Elcrovox 1/4 that used the secret NSA SAVILLE encryption algorithm. Keys were loaded into the device by means of a DS-102 fill unit, such as the KYK-13 or the KOI-18. The Elcrovox 1/4 was interoperable with the American STU-II crypto phone.

Known ELCROVOX devices
ELCROVOX equipment on this website
Elcrovox 1/3 voice encryptor Elcrovox 1/4D narrow band voice and data terminal (STU-II compatible)
ELCROTEL
ELCROTEL was a series of encryption devices for teleprinter (telex) signals, generally using the 5-bit Baudot or ITA-2 standard, running at speeds between 45.45 baud and 1200 baud.

Known ELCROTEL devices
ELCROTEL equipment on this website
ELCROTEL 5 telegraphy encryptor Abrufimpulsegenerator for ELCROTEL 4
AIG
ELCRODAT
ELCRODAT was a series of data and bulk encryptors, developed by Siemens for the AUTOKO data communications system, used by the German Army (Bundeswehr). Both ELCRODAT and AUTOKO were also used by the 2nd Danish Signal Battalion, to maintain contact with the German counter­part 610 GE SigBN in Rendsburg [3]. The name ELCRODAT is also used for a series of desktop phone and fax encryptors, currently available from Rohde & Schwarz.

Known ELCRODAT devices
  • ELCRODAT 4/1
    AUTOKO voice and data encryptor with FEC and HF modem
  • ELCRODAT 4/2
    Data encryptor (2002)
  • ELCRODAT 5/2
    VHF/UHF voice and data encryptor with FEC
  • ELCRODAT 5/4
    Voice encryptor (2003)
  • ELCRODAT 6/1
    Encrypted ISDB phone
  • ELCRODAT 6/2
    ISDN voice and data encryptor
ELCRODAT equipment on this website
Elcrodat 6-2 ISDN voice and data encryptor further developed by R&S
ELCROBIT
ELCROBIT is a series of data encryptors, initially developed by Siemens.

Known ELCROBIT devices
  • ELCROBIT 3/1
    Data encryptor 64 kbps CCITT V.24/V.10, RS-232-C
  • ELCROBIT 3/2
    Data encryptor 64 kbps CCITT X.21/V.25 bis
ELCROBIT equipment on this website
Testdevice (Prüfgerät) for Elcrobit PGEb-96-2
ELCROMUX
ELCROMUX was a series of bulk encryption devices, also known as trunk encryption devices, initially developed by Siemens and ANT for data transmissions up to 2 Mbps.

Known ELCROMUX devices
  • ELCROMUX 1/1
    Bulk encryptor with optical interface
  • ELCROMUX 1/2
    Bulk encryptor with EUROCOM interface
  • ELCROMUX 1/3
    Bulk encryptor with CCITT interface
References
  1. Siemens AG, Encryption Equipments from Siemens
    Company brochure, 6 pages. 1991.

  2. Joachim Beckh, Blitz & Anker, Geschichte & Hintergründe, Volume 2
    ISBN 3-8334-2997-6. Date unknown.

  3. Jerry Proc's crypto pages, Elcro family
    Retrieved march 2018.
Further information
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© Crypto Museum. Created: Monday 26 March 2018. Last changed: Sunday, 11 November 2018 - 17:00 CET.
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