Strategisch Verbindingsinlichtingen Centrum
In the Netherlands, Strategisch Verbindingsinlichtingen Centrum (SVIC)
– Strategic Signals Intelligence Centre –
was a part of the Military Intelligence and Security Agency (MIVD),
traffic- and cryptanalysis (codebreaking) of intercepted
foreign military and diplomatic (radio) traffic, an behalf of the Dutch
Government and the Dutch Armed Forces.
The organisation was formerly known as
TIVC and until 1982 as
WKC, and can be seen as
the (smaller) equivalent of the American NSA
and the British GCHQ.
had several partnerships
with foreign intelligence agencies,
such as the secret Western codebreaking alliance MAXIMATOR
Although SVIC was initially a military (naval) organisation, operating
under the responsibility of the
Military Intelligence Service (MIVD),
it also worked for, and provided information to, the Dutch civil intelligence
In 2014 it was absorbed into the newly established
Joint Sigint Cyber Unit (JSCU)
of the AIVD and MIVD.
The former SVIC unit is currently located in The Hague.
Related subjects on this website
1914 - 1940
General Staf, Sectie IV
General Staff, Section IV
1949 - 1975
Marine Inlichtingendienst, Afdeling VI
Naval Intelligence Service, Department 6
1975 - 1982
1982 - 1996
Technisch Informatieverwerkings Centrum
Technical Information Processing Centre
1996 - 2014
Strategisch Verbindingsinlichtingen Centrum
Strategic Signals Intelligence Centre
2014 - present
Joint Sigint Cyber Unit
SVIC has several partnerships with foreign sister organisations,
most of which are bilateral and should be considered secret.
According to Gerhard Piper in , WKC/TIVC had a
bilaterial partnership with Germany
since 1967. In April 2020,
Dutch Professor of computer security Dr. Bart Jacobs revealed that
since 1978, TIVC has a secret partnership
with Denmark, Sweden, Germany and France, under the name
This partnership is now widely regarded as the European equivalent of
the UKUSA Fives Eyes alliance,
and is active to this day (2022).
So far, the following partnerships are publicly known:
The history of SVIC dates back to 1914, with the foundation of
Section IV of the Generale Staf (GS) (General Staff) of the Army (GS IV).
This eventually became Department IV of the Naval Intelligence
Service (MARID) — established in 1949 — and became known as MARID VI.
In 1975, MARID VI was spun out as Wiskundig Centrum
(Mathematics Centre) — WKC —
and was initially located at the attic of Villa Maarheze
— home to the Foreign Intelligence Service (IDB) —
before moving to Kattenburg, the
Marine Establishment Amsterdam (MEA) in Amsterdam (Netherlands).
In 1982, WKC
was renamed Technisch Informatieverwerkings Centrum
(Technical Information Processing Centre) — abbreviated TIVC.
In 1996, TIVC
was renamed Strategisch Verbindingsinlichtingen Centrum
(Strategic Signals Intelligence Centre) — abbreviated SVIC.
In 2005, SVIC left the historical location Kattenburg in Amsterdam,
and was relocated at the Frederik Kazerne in The Hague (Netherlands) — the headquarters
of the Military Intelligence Service (MIVD).
From its foundation in 1975, WKC/TIVC/SVIC was located at the Naval
Establishment Kattenburg in Amsterdam (Netherlands), where the
information, gathered by a number of (radio) intercept stations, was
analysed and processed. In 2005, SVIC moved from
Amsterdam/Kattenburg to the Frederikkazerne in The Hague, the
headquarters of the Military Intelligence Service (MIVD).
For intercept of satellite traffic (SHF), 1 the most important sources of
information are the satellite groundstations in Zoutkamp (Groningen,
Netherlands), and – since 2006 – an additional one in nearby
Burum (Friesland). For interception of high frequency (HF) 2 radio
traffic, the organisation relies on its monitoring stations in
Eemnes (Utrecht) and Eibergen (Gelderland) and,
since 1963, in the Caribbean – at Curaçao 3 –
with Venezuela and Cuba as main targets .
SHF = Super High Frequency (3-30 GHz)
HF = High Frequency (3-30 MHz)
Closed on 1 July 1990  around the same time as a listening post
was opened in French Guiana .
The intercept station in Eibergen — in the eastern part of the
province of Gelderland, close to the German border — is used for
collection of intelligence on the Short Wave (HF) radio bands.
It is built around a so-called
that was supplied by British manufacturer
Roke Manor Research.
The system consists of 52 so-called Sarsen antennas, arranged in 4
concentric circles, plus a number of underground receivers .
By using digital correlation techniques and adaptive digital beamforming
(ADBF), it can be used for
Super-Resolution Direction Finding (SRDF),
as well as for (omni)directional reception of HF signals
in the horizontal and vertical plane (3D).
LOCATE was part of project ROOD, which is short for
Radio Ontvangst Omni Directioneel (Omni-Directional Radio Reception).
The project was lauched in 1997 and would be the first of its kind
in the world . At the time, radio interception was the responsibility
of the Dutch National Sigint Organisation (NSO), which has since been merged
into the Joint Sigint Cyber Unit (JSCU).
➤ More about LOCATE
The most important task of WKC/TIVC/SVIC is traffic-analysis and crypto-analysis,
commonly known as codebreaking. As part of its partnership in the
MAXIMATOR alliance, it was capable of deciphering
the (mostly diplomatic) traffic from nearly 75 countries for more than 50 years .
was a successful electronic
cipher machine, developed in the late
1970s by Philips Usfa
in The Netherlands, for exclusive use by NATO.
The device used a secure Philips-developed hardware-based encryption algorithm
that had been approved by NATO's evaluation authority SECAN.
With NATO's consent, Philips also produced variants for internal
communications of certain countries, such as the Dutch Police and the
Dutch Ministry of Foreign affairs. Even Austria — not a NATO member —
was allowed to use Aroflex for its secure internal communications.
But there were also versions of Aroflex that were rigged in such a
way, that they became friendly. In other words: that their traffic
was readable (breakable) by certain intelligence agencies. This machine
was known as the T-1000/CA
and was officially sold by
as the civil version.
was internally known by its nickname 'Beroflex', and
used a hardware-based crypto-logic (at the time known as a crypto-heart),
implemented in custom chips,
that were developed with help from TIVC.
Philips had also developed its own rigged algorithm, but choose to
implement the TIVC one, as it involved the least modification of the
existing Aroflex design .
But even with the rigged crypto-logic in place, breaking the cipher
was not trivial. It involved solving a set of binary equasions
an exponentially large number of times, which was beyond the capability
of a general purpose computer at the time. TIVC subsequently teamed up
with Philips Research (NatLab) to develop a dedicated chip to assist
in solving the binary linear equasions.
For the development of the chip, TIVC had attracted two young engineers,
who worked on it from 1975 to 1977. Eventually, a total of 36 of these
chips were used at the heart of a so-called special purpose device
that was able to solve the cipher in approx. 40 minutes .
The SPD was subsequently supplied to the the US (NSA)
and to the MAXIMATOR member states.
➤ More about Aroflex
Until the mid-1980s, Türkiye had been using a
One-Time Tape cipher machine
from the French manufacturer Sagem.
Although such a machine is theoretically
unbreakable — it is based on the
One-Time Pad (OTP) — the Turks made the
mistake of using the same key tape multiple times (and even looping it),
as a result of which everone could break it, including the
USSR and TIVC.
Around 1983, after Aroflex had been rolled out in most NATO
countries, including Türkiye, the Turkisch Government wanted to buy
additional machines for the encryption of its diplomatic traffic.
But NATO refused: Aroflex was a NATO-only device and was not
allowed for civil use.
The Turkish Goverment then wanted to obtain cipher machines from
Swiss manufacturer Crypto AG
(not knowning that the company was
owned by BND
but the partners (BND
and CIA) could not
decide about whether NATO-partner
Türkiye should get secure or rigged machines. 1
The CIA wanted to supply rigged
Crypto AG equipment to Türkiye,
but BND refused as Türkiye was a NATO partner.
CIA then asked
Siemens to make a more secure version of their
but Siemens (logically) declined, as they had no control
over the crypto-logic of a Philips machine.
CIA then turned to the
Dutch COMSEC authority NBV, to approach
Philips with the request to develop a rigged Aroflex variant
for Türkiye. Philips complied and made a
Beroflex cryptologic that had the signature of a genuine Aroflex.
Türkiye accepted the design, and the machines were rolled out from
1988 onwards. The new crypto-logic defeated the regular codebreaking
method by means of the Special Purpose Device, and the CIA insisted that
the approprate solution of the cipher was kept from Germany.
For this reason it was also kept from partner TIVC .
Although TIVC was initially unable to break the Turkish diplomatic
traffic encrypted with the special
Turkish Aroflex, they later learned
the details of the encryption algorith and were able solve it entirely in
software. By the late 1980s, the available computing power had increased
dramatically, so that a special purpose device was no longer needed
to solve the cipher .
WKC/TIVC was one of the first organisations in the Netherlands to use
computers for solving cryptographic problems (codebreaking), and
had access to a ZEBRA computer as early as 1958 .
ZEBRA – short for Zeer Eenvoudige Binaire Reken Automaat (Very Simple
Binary Automatic Calculator) – was the first computer to be
developed in the Netherlands after the ARRA .
In the mid-1960s, the range of computers was extended with the IBM TEMPUS
and computers from other manufacturers like
Siemens and Racal .
In 2008 it was announced that the
Dutch Military Intelligence Service
had purchased two supercomputers from American manufacturer
Silicon Graphics (SGI) , just a few months before
the latter filed for bankruptcy.
The supercomputers were known as Hercules and Hyllus, but these might
have been codenames used by the Dutch.
In the article it was confirmed that the new supercomputers
would be used for codebreaking  — typically the
responsibility of SVIC.
- Wikipedia, Militaire Inlichtingendienst (Nederland)
Retrieved April 2020.
- Wikipedia, Strategisch Verbindingsinlichtingen Centrum
Retrieved April 2020.
- Nationaal Veiligheidsarchief / inlichtingentingendiensten.nl
Buro Jansen & Janssen. Retrieved April 2020.
- Paul Huz, Afluisterpraktijken
Homow-Universaliz, 13 June 2007.
- Prof. Dr. Bart Jacobs, Maximator
European signal intelligence cooperation, from a Dutch perspective
Intelligence and National Security, Taylor & Francis Online, 7 April 2020.
- Huub Jaspers, De afluistervrienden van Nederland
VPRO Radio, Argos, 8 April 2020.
- Jaime Karremann, Waarom de Russen het Marineterrein in Amsterdam in de gaten hielden
11 January 2018.
- Gerhard Piper, Abhörstaat Deutschland (Telepolis)...
ISBN 978-3-95788-028-4 (epub). February 2015. Page 152.
- Bob de Graaff en Cees Wiebes, Villa Maarheze
ISBN 978-901208-219-8. January 1999.
- Paul Reuvers and Marc Simons, Operation RUBICON
Crypto Museum, 19 March 2020.
- Anonymous source, about the Aroflex Special Purpose Device
Interview, March 2020.
- Wikipedia, ZEBRA (computer)
Retrieved April 2020.
- Matthew M. Aid and Cees Wiebes,
Secrets of Signals Intelligence During the Cold War and Beyond
ISBN 0-7146-8182-2. 2001. Page 255.
- M.W. Jensen, G. Platje, De MARID
ISBN 978-9-010208-375-1, 1997. Page 250.
- Peter Müller, Ulrich Stoll & David Ridd, Geheimoperation 'Maximator'
Frankfurter Rundschau, 1 July 2020.
- Ingelicht, Hercules Computer in Gebruik Genomen
Dutch MoD, October 2008 - Nr. 5, p. 10.
- Ingelicht, Nieuwe antenna in Eibergen komt in zicht
Dutch MoD, October 2008 - Nr. 5, p. 11 (Dutch).
- Ingelicht, Informatieavond Eibergse NSO-buren
Dutch MoD, October 2007 - Nr. 5, p. 10 (Dutch).
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