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Secret Communications 3
16 and 23 November 2019, 7 and 21 December 2019, and 12 January 2020

Following the success of our exhibitions Secret Communications 1 and Secret Communications 2, Crypto Museum has once again teamed up with the Foundation for German Communication in Duivendrecht (near Amsterdam, Netherlands) for the exhibition Secret Communications 3. This exclusive exhibiton will be open to the general public the following days:

On these days, we will be open from 10:00 to 17:00 and admission is free. Furthermore, coffee, tea and sandwiches will be available free of charge. We will be showing an exciting collection of cipher machines and espionage gear, some of which have never been on public display before. Check the overview below to see what we have selected for you. Large groups may apply for a visit outside the regular opening days and times. Contact Arthur Bauer to make arrangements.

 What to expect

Click here to download the leaflet

Main themes
The exhibition will cover the following four main themes:

  1. Enigma & Friends
    Enigma is arguably the most famous and well-known cipher machine in the world. We have shown it previously in its many variations, with all kinds of peripherals, as it was used by the German Third Reich during World War II for their secret communication. We will show it again this time, complemented by other technologies, such as secret telephone scramblers from World War II. In addition, Tatjana van Vark will show and demonstrate her wonderful Super-Enigma, but note that she will not be present on all opening days.

  2. Bugs
    This time we will show some unique covert listening devices (bugs) that were used during the Cold War by the Stasi and the CIA. We will also explain the methods of hiding such devices and how sweep-teams were able to track them down. We are able to give a good impression of the techniques used by the West as well as by the Eastern Block, and will be able to show some exiting examples. Note that many of the bugs used by the CIA were developed and manufactured by a Dutch company, from the 1950s well into the 1990s.

  3. Philips Crypto
    As Crypto Museum is based in Eindhoven, some of our collection is dedicated to the history of cipher machines that were developed by Philips Usfa (later: Philips Crypto). Over the past few years, our collection has grown to the extent that we are now able to show most of the equipment that was developed and manufactured by this company. See why Philips Crypto once belonged to the — big four — in the crypto-world and why Philips was allowed to supply to NATO. An impressive range of impressive products. Hear the story of the rise and fall of Philips Crypto.

  4. Car phones (ATF)
    In addition to the above subjects, we will share with you the history of car phones (cellular networks) in the Netherlands in the days before GSM. Learn how the networks were penetrated by criminals, to use it for blackmailing and for making clandestine phone calls. We will be showing items that have been confiscated by the police and that have not been on public display before. Learn how cryptography and authentication became mandatory in the GSM network, and what role PTT Telecom (now: KPN) played in this.

    We will also show tapping techniques for both mobile and land lines, including a complete tapping room of the police who - in cooperation with PTT Telecom - intercepted criminal conversations.
Things to expect
Last updated 4 June 2019

Below is a non-exhaustive overview of the items we will be showing and demonstrating in this exhibition. Further information on each item is available by clicking the corresponding thumbnail image below. This list will be updated regularly so please visit this page again soon.

Enigma I
Naval Enigma M4 (used by the U-Boats or the German Kriegsmarine)
The main Commercial Enigma machine on which all later models were based
Zählwerk Enigma A28, the predecessor of the Enigma G
Special version of Enigma K for the Swiss Army
Schreibmax printer attachement
Enigma Uhr (also known as UhrBox)
Umkehrwalze D
Fialka M-125 cipher machines
Abwehr spy radio set SE-109/3
Abwehr spy radio set SE-98/3
DDR spy radio set 'Type 2'
British WWII scrambler phone used by Churchill
German WWII phone scrambler
KG-84 data encryptor
KY-68 Digital Secure Telephone
TAROLEX key stream generator
Ecolex X (Ecolex 10) online/offline cipher machine
Aroflex UA-8116
Miniflex UA-8036
Picoflex UA-8035
Spendex-10 tactical speech encryptor with Delta Modulation
Philips Spendex-40 secure telephone for voice, fax and computer
Philips Spendex-50, military secure crypto phone (a.k.a. DBT)
Philips PNVX secure crypto telephone
PFDX fact encryptor
PFX-PM portable radio with digital encryption
Secure communication for the Eindhoven Police via Motorola MDT-9100 terminals
Hand-held consumer communication terminal with crypto facilities
Computer and network security PCMCIA card for the Dutch Government
Lawful analogue telephone intercept system developed by the Dutch PTT
General coverage panoramic intercept receiver
General coverage panoramic intercept receiver (2 GHz)
Dutch intercept receiver for 1st generation car phones
Scanlock series of TSCM receivers and other Audiotel equipment
Mason surveillance receivers
Various bug detection devices made by Research Electronics International (REI)
Rohde & Schwarz EB-200 Monitoring Receiver 10 kHz - 3 GHz
Transistorized Russian bug used by the KGB around 1964
Secret CIA research project to develop Passive Bugs, carried out by the NRP in The Netherlands
Easy Chair resonant cavity microphone
290 MHz bug with TP audio masking
350 MHz bug with RP audio masking
SRR-52 listening post receiver
Stasi wired audio bug (NF)
Long-range DDR miniature 375 MHz radio bug with microphone
Short-range DDR miniature 950 MHz radio bug with built-in microphone
Medium-range DDR miniature 950 MHz radio bug with pre-amplifer
Long-range DDR miniature 950 MHz radio bug with power amplifier
Mobile 972 MHz bug with subcarrier audio-masking (DDR & Bulgaria)
RF bug 31217-132 (Botond) concealed in piece of wood
RF bug Holzwurm in vertical stick (950 MHz)
Hacked German Becker car phone (Telefunken)
Hacked Castor car phone (AEG 4015C)
Hacked Pollux car phone (Motorola)
More items will be added over the next few months. Check this page regularly to see when new items have been added.
Click to see more

The exhibition is located at the premises of the Foundation for German Technology, the private museum of Dutch collector Arthur Bauer and his wife Karin, which is located in Duivendrecht, near Amsterdam (Netherlands). Click the map above for Google directions. The address is:

Kloosterstraat 23-25
1115 BJ Duivendrecht

 Find the museum on Google maps

 Arthur Bauer's museum
 Shadow server (in case the above link doesn't work)

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