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Motorola USA Phone SECTEL ← 3500
Secure voice/data terminal · Type 4
SECTEL 9600 is a secure telephone introduced
around 1990 by Motorola in Seguin (Texas, USA).
It uses Motorola's proprietary Digital Voice International (DVI)
encryption algorithm, which offers a reasonable level of security [2].
It is classified as an
NSA Type 4 product,
which means it can be used for non-sensitive unclassified information — typically
business applications. The device was freely
available to US businesses as a COTS product.
Note that it is not STU-III compatible.
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It offers two methods for key management:
manual mode, in which keys are generated by the system itself, and
automatic public key (APK) which offers a 'keyless' RSA-based technology for
exchanging the keys [1].
The SECTEL 9600 is capable of sending voice and data simultaneously
at different speeds, depending on the quality of the (analog) telephone
line. A series of advanced speech processing algorithms (LPC-10e, CELP
and MRELP) have been implemented to ensure superior voice quality at
different baud rates [A].
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The SECTEL 9600 was introduced by Motorola around 1990 as a spin-off of
the highly successful STU-III telephones (SECTEL 1500
and SECTEL 2500) that were developed for the US Goverment.
As the SECTEL 9600 is an NSA Type 4 device,
it could be purchased by virtually any business in the US without
obtaining an ITAR licence. However, due to the relatively
high price (US$ 4495) and the expected
limited security of the DVI algorithm, it never met the anticipated
popularity.
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PLEASE HELP —
Although all STU-III telephones have now been discontinued and the
SECTEL unit itself is not classified, it is very difficult to obtain
information about this unit. Any information, such as the user manual,
is most welcome. If you can help us in any way,
please contact us.
At 2400 baud, the SECTEL 9600 uses a 2.4 kbps Linear Predictive Coding
algorithm known as Enhanced LPC-10. It is based on the
FS-1015
or STANAG-4198 standard that is also used with the
Philips PNVX crypto phone.
It is suitable for both half and full duplex.
At 4800 baud, Code-Exited Linear Predictive Coding or CELP
is used in full-duplex, providing better audio quality.
At the highest speed, 9600 baud, an even better algorithm, called
Modified Residual Exited Linear Predictive Coding or MRELP,
is used in full duplex.
The SECTEL 9600 has a built-in V.24/V.32 modem that can also be used
for computer data at baud rates ranging from 75 to 9600 baud.
It is tested and compliant with most telephone systems around the world.
If the quality of the (foreign) telephone line is below average, the
system gracefully degrades to a lower speed, but maintains its Type 4
security.
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To suit both the safety requirements of the customers and US Government
regulations, different SECTEL models were manufactured, all based on the same
basic hardware design and enclosure. The firmware and the cryptographic
algorithms are different however. The diagram below shows how they
are positioned. Only the SECTEL 1000 series and
2000 series are STU-III compatible.
Click any of the balloons above for additional information about the
related SECTEL model. The SECTEL 9600 is not compatible with any of
the other SECTEL models. It can only be used in combination with other
SECTEL 9600 units.
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Below are the list prices of the various models [1]. From this list
it becomes clear that a higher price does not mean better security.
On the contrary: the SECTEL 9600 is the least secure product, which
is more than twice the price of the most secure device
— the SECTEL 1500.
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- SECTEL 1500, Type 1, sold for US$ 1800
- SECTEL 2500, Type 2, sold for US$ 2145
- SECTEL 3500, Type 3, sold for US$ 3395
- SECTEL 9600, Type 4, sold for US$ 4495
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The SECTEL 1500 phone is powered by an external Power Supply Unit (PSU)
that provides three different voltages: +5V (1.75 A), +12V (250 mA) and
-12V (210 mA). The PSU is connected to the 7-pin (or 8-pin) 270° DIN
socket at the rear of the unit. The socket has the following pinout:
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- +12V
- -12V
- +5V
- 0V (GND)
- 0V (GND)
- +5V
- 0V (GND)
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Device Encrypted PSTN telephone Purpose Sensitive voice conversations Model SECTEL 9600 Family SECTEL Developer Motorola Manufactuer Motorola GEG Year 1990 Country USA Users US Government-approved customers Speed 2400, 4800, 9600 baud Vocoder LPC-10E, CELP, MRELP Encryption DVI (NSA Type 4) Keys Manual, RSA CIK KSD-64 Dimensions ? Weight ? Quantity ? Price USD 4495
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© Crypto Museum. Created: Sunday 11 July 2010. Last changed: Monday, 23 September 2024 - 09:07 CET.
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