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Philips Usfa Crypto
Tactical digital communication network
ZODIAC was the name of an integrated communication system that was
used by the Dutch Armed Forces from 1979 until the early 2000s.
ZODIAC is an acronym for
Zone Digitaal Automatisch Cryptografisch beveiligd
(Area Digital Automatic Cryptographically secured).
ZODIAC marked the beginning of the digital era for the Dutch Army,
as all telephone and telegraphic traffic (telex) was digitised, bundled
(multiplexed), automated and secured with proprietary encryption algorithms.
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ZODIAC was based on the DELTACS [4] tactical area communications system,
which was a joint development of
Hollanse Signaalapparaten (HSA) in
Huizen (Netherlands) and GTE Government Systems Corporation in
Massachusetts (USA). All crypto-equipment was developed by
HSA's sister company
Philips Usfa (later: Philips Crypto).
The project started in 1975 and was completed in 1987.
The last units were delivered in 1991.
High-end digital cryptographic solutions – all developed by the Dutch
manufacturer Philips Usfa –
allowed greater security for an increased number of users.
ZODIAC was designed to be (partly) interoperable with the communications equipment of
other NATO countries (see below).
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The image above shows a Dutch Army communication shelter with a fully
automatied DELTACS switch, or exchange,
being operated by two men. The interfaces and
controls are on the left, whilst the computer is mounted in the 19" rack at
the right.
The image was taken from the June 1984 issue
of Philips Telecommunication
Review, which is available for download below [4].
In the early 2000s, ZODIAC was gradually phased out and replaced by
the newer TITAAN system.
To smoothen the transition, some ZODIAC components
were retained during the first
stages of the TITAAN
implementation, such as the
BVO-M (MUCOLEX II)
for which external contractor TNO developed a new interface [5].
The last ZODIAC components were decommissioned in 2007.
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ZODIAC equipment on this website
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In the early 1970s, the Dutch Army started looking for a new communication
system that would replace the ageing manual telephone exchanges. As most
European countries were developing their own communications networks
at that time,
the so-called EUROCOM group was established. The aim was to establish a set
of common parameters — the EUROCOM standards — that would allow the various
NATO countries to communicate with each other [1][2][4].
Around 1975, the ZODIAC project was born. It was the Dutch contribution to develop a complete automated secure communication system for use by their
national forces.
Philips daughter HSA (now Thales)
won the initial NLG 200 million
contract to start development of a suitable system.
As HSA was part of the
multinational Philips organization, they commissioned sister companies
Philips Telecommunicatie Industrie (PTI)
to carry out a system study in 1978/79,
whilst Philips Usfa
studied the cryptographic implications.
In 1980/81, this resulted in development orders for Philips Usfa, for the
design of BVO-M, BVO-T
and the crypto heart of the DBT crypto phone.
A few years later, the first machines were delivered, and in 1987 the ZODIAC
system was completed — 12 years after its inception.
Development of ZODIAC took place in five stages:
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- Digital
In the first stage, the existing network was completely digitised.
All digitised signals were 'stacked' or 'bundled' in a single
data stream, so that they could be encrypted together.
From the user's perspective, it was a fully transparent system that
offered a high level of security.
The first experiments were carried out in 1979 when the various stages
of the Delta Modulation (CVSD) equipment were tested.
- Telex
In the second stage, all teletype traffic (telex) was automated.
the manually operated telex networks were replaced by ATS -
Automatisch Telegrafie Systeem (Automated Telegraphy System).
ATS was introduced in 1980.
After this, developments slowed down somewhat.
Despite the new network, it still took too long to connect a subscriber to
another party and parts of the network were sometimes unavailable for
too long.
- Automatic Telephone Exchange
In the 3rd stage, the manually operated telephone exchange was replaced
by a fully automatic switch. This allowed users to initiate a call or send
data themselves, whithout the need for operator intervention.
- Additional nodes
In this stage, the number of nodes in the network, was increased
drastically.
As the introduction of the new automatic exchanges was delayed several
times, it was decided to combine stages 3 and 4, and roll them out together.
- New equipment
At the same time, new equipment was introduced, such as a secure digital
telephone set which became known as DBT,
and a PC-based Telex system called PCT.
In 1987, ZODIAC was complete, after it had passed all tests with flying colours.
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ZODIAC can be connected to and is (partly) interoperable with a variety of
other systems and communication standards, including the following:
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- RITA
- AUTOKO
- Ptarmigan
- Tri-Tac
- NATO Alternate Mobile Way HQ
- EUROCOM
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2Mb/s digital unit for the encryption and decryption of multiplexed
bundled data streams. Officially designated UA-8244 or MUCOLEX II and
backward compatible with the existing 1Mb MUCOLEX I units
of the Royal Dutch Army.
➤ More information
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2Mb/s digital unit for the encryption and decryption of multiplexed
bundled data streams. Officially designated UA-8245 or MUCOLEX III and
compatible with the KG-81 —
the standard Trunk Encryption Device (TED) of the US Army.
Intended for interoperability between ZODIAC and the
radio systems of other
NATO partners.
➤ More information
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Advanced ruggedized wide-band digital crypto phone, designated UA-8246
or Spendex-50,
developed by Philips Usfa. It uses
CVSD (delta modulation), and allows secure speech and data to be transferred
at 16 kb/s or 32 kb/s.
Speech (and data) is secured by means of the secret
SAVILLE cryptographic algorithm.
➤ More information
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Personal Computer Telex (PCT) is a
PC-based replacement of the older
electro-mechanical teletype units (telex),
consisting of a robust portable PC (slightly larger than a laptop)
running DOS and suitable software.
PCT was based on the Toshiba T-3200SX portable PC, with a complementary
needle-based impact printer.
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Ruggedised unit for encryption and decryption of multiplexed
bundled data streams at 1 mb/s. Officially designated UA-8451 or MUCOLEX I.
The device was designed and delivered during the 1970s and was
already in widespread use when ZODIAC came into service.
➤ More information
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DELTAMUX was a European standard (EUROCOM) that allowed digital switches
from different countries/manufacturers to talk to each other.
Each DELTAMUX unit allows 16, 32 or 64 subscriber lines of 16 or 32 kbit/s
each, to be multiplexed into a 256, 512 or 1024 kbit/s bit-stream.
Mobile DELTAMUX units were suitable for the integration into communication
vehicles.
➤ More information
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In 1993, the Dutch Ministry of Defense was in desperate need for new
personnel. As part of a nation-wide campaign they aired a series of five
different commercials on TV. The video below is the forth in this series.
It shows brief glimpses of a ZODIAC communication shelter in operation.
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The Royal Dutch Signals Museum
(Museum Verbindingsdienst)
has a
complete and operational ZODIAC system that can be demonstrated to the public.
It was rebuilt from the contents of a former communications shelter,
and consists of a complete HSA digital switch with delta-modulation
(DELTAMUX), a series of Philips
BVO units,
some DBT phones
and PCT telex units.
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The images below were taken at the
Royal Dutch Signals museum
in July 2008, shortly before the museum was moved to its present
location in Amersfoort.
It is currently being shown and demonstrated in a much better environment.
At the right is the heart of the 68000-based digital switch.
Note that the Crypto Ignition Key (CIK) is missing from the
DBT unit
in image #5,
but that it is present on the DBT phones mounted inside the shelter,
visible in images
#1
and #2.
Secure communication was only possible when the CIK was present on
the DBT.
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The shelter was connected to the rest of the world through a variety of
mediums, including land-lines and radio links. Also in the museum is (was)
a complete communication truck with DELTAMUX units, line interfaces,
radio trunks, etc. Check the rightmost three images below.
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HSA
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Hollandse Signaal Apparaten
Former Philips subsidary, specializing in the development and production of
equipment for the Department of Defense (DoD). Later sold to Thales.
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PTI
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Philips Telecommunicatie Industrie
Philips subsidary based in Hilversum (Netherlands), specializing
in telecommunication solutions and automated switches.
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TED
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Trunk Encryption Device
American KG-81
cipher device for muliplexed digital data streams, used as a
common standard between NATO countries.
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- Bart Omloo, Afscheid van ZODIAC
Intercom, 2004, Volume 2, p. 36-37 (Dutch)
- G.J. Huisman, De geboorte van ZODIAC
Intercom, 2009, Volume 4, p. 53-55 (Dutch)
- Jane's Military Communications, DELTACS, ZODIAC
Fifteenth Edition, 1994-95, p. 803.
ISBN: 0-7106-1163-3
- AJW van Daal & P van der Vlist, DELTACS - a versatile tactical communication system
Philips Telecommunicatie Industrie BV (PTI), Hilversum (Netherlands), 1984.
Reprint from Philips Telecommunication Review, Vol. 42, No. 2, pages 74-89.
- A. Regtien & HW Evers,
TITAAN: Flexibel en veelzijdig, maar ook veilig en betrouwbaar
Intercom, 2001, Volume 4, p. 58-59 (Dutch)
- Koninklijke Landmacht, ZODIAC (Dutch)
Published by the Human Resource Department of the Dutch Army. 1988.
Crypto Museum #301329.
- Holland Signaal, DELTACS Leaflet
Delta-modulation Tactical Area Communications System (English). 1987.
- MJ van de Fliert, PTT op Wielen, verbindingen altijd 'op scherp'
Description of ZODIAC in action (Dutch). Legerkoerier. December 1988.
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© Crypto Museum. Last changed: Wednesday, 08 May 2024 - 13:33 CET.
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![DELTACS in operation [4]](img/deltacs_full.jpg)
