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Neue KINOFILME 2017 Trailer Deutsch German (KW 26) 29.06.2017
Neue KINOFILME 2017 Trailer Deutsch German (KW 26) 29.06.2017
Published: 2017/06/23
Channel: KinoStarDE
KW26 Acer Week DE
KW26 Acer Week DE
Published: 2017/06/26
Channel: Interdiscount
kika TV-Spot KW 26: Sommerschlussverkauf
kika TV-Spot KW 26: Sommerschlussverkauf
Published: 2017/06/26
Channel: kikaWohnen
Neue KINO TRAILER 2016 German Deutsch (KW 26)
Neue KINO TRAILER 2016 German Deutsch (KW 26)
Published: 2016/07/03
Channel: FilmSelect
Best of DrachenLord | KW 26 [Haider Cut]
Best of DrachenLord | KW 26 [Haider Cut]
Published: 2016/07/03
Channel: Lutschkind
Lavor KW 26 - смываем колпак.mp4
Lavor KW 26 - смываем колпак.mp4
Published: 2010/06/04
Channel: hmelkow
[Filofax-Timelapse] KW 26/17: Research Diary
[Filofax-Timelapse] KW 26/17: Research Diary
Published: 2017/06/25
Channel: YasminLowe
Wochenübersicht Bullet Journal | KW 26 | Deutsch
Wochenübersicht Bullet Journal | KW 26 | Deutsch
Published: 2017/06/17
Channel: Janoschka La
Christoph Hoerstel zur Lage   KW 26
Christoph Hoerstel zur Lage KW 26
Published: 2016/07/02
Channel: Christoph Hörstel
Kanal3 Obersteiermark KW 26 2017
Kanal3 Obersteiermark KW 26 2017
Published: 2017/06/22
Channel: kanal3tvregional
SchlagerNews 2017 KW26
SchlagerNews 2017 KW26
Published: 2017/06/26
Channel: Gute Laune TV
KW26/17 Streamübersicht Twitch & Uploadplan Youtube ✿ Gorbinski666
KW26/17 Streamübersicht Twitch & Uploadplan Youtube ✿ Gorbinski666
Published: 2017/06/25
Channel: Gorbinski666
LAVOR 고압세척기 KW26 사용영상 160bar
LAVOR 고압세척기 KW26 사용영상 160bar
Published: 2016/03/18
Channel: 라보코리아
2017 SLY Kazuki Watanabe #KW26 Onboard lap with Ninja250 SL
2017 SLY Kazuki Watanabe #KW26 Onboard lap with Ninja250 SL
Published: 2017/04/17
Channel: Kazuki Watanabe
News KW 26
News KW 26
Published: 2017/06/28
Channel: M4 TV
Uniplaner KW 26
Uniplaner KW 26
Published: 2016/07/02
Channel: berlinermelodie
Wochenwetter Achensee von 27. Juni bis 3. Juli (KW 26)
Wochenwetter Achensee von 27. Juni bis 3. Juli (KW 26)
Published: 2017/06/26
Channel: Achensee - Tirols Sport & VitalPark
Bauen und Wohnen KW 26/2017
Bauen und Wohnen KW 26/2017
Published: 2017/06/26
Channel: LaendleTVNews
LTV Wochenmagazin KW 26/2017
LTV Wochenmagazin KW 26/2017
Published: 2017/06/26
Channel: LaendleTVNews
Generator Diesel Silent Krisbow 5 kVA (KW26-08)
Generator Diesel Silent Krisbow 5 kVA (KW26-08)
Published: 2014/08/11
Channel: Ranggasatya Akbar
Wochendekoration KW 26
Wochendekoration KW 26
Published: 2017/06/25
Channel: filofee_
Neues aus Gera für Thüringen (KW 26/2017)
Neues aus Gera für Thüringen (KW 26/2017)
Published: 2017/06/28
Channel: labor14 - Thüringer Lernsender
OpelSommerGrillen 872 kw26 NEU
OpelSommerGrillen 872 kw26 NEU
Published: 2017/06/28
Channel: M4 TV
MEMA TV - KW 26 - Kunst u  Gartenzauber Schloss Pichl i. M.
MEMA TV - KW 26 - Kunst u Gartenzauber Schloss Pichl i. M.
Published: 2017/06/27
Channel: MEMA TV
Wochenausblick 44.KW. 26.-30.10.2015
Wochenausblick 44.KW. 26.-30.10.2015
Published: 2015/10/26
Channel: Markttechnik erfolgreich handeln Mario Lüddemann
echt Hochschulmagazin | Campus News - KW 26
echt Hochschulmagazin | Campus News - KW 26
Published: 2017/06/27
Channel: echt - das Hochschulmagazin
MEMA TV - KW 26 - Generationenpark Eröffnung St.Lorenzen i. M.
MEMA TV - KW 26 - Generationenpark Eröffnung St.Lorenzen i. M.
Published: 2017/06/27
Channel: MEMA TV
Steiermark KW26
Steiermark KW26
Published: 2017/06/22
Channel: kanal3tvregional
Box Office Tippspiel 2017 KW 26
Box Office Tippspiel 2017 KW 26
Published: 2017/06/27
Channel: STEFFO
[ Deko KW 26 ] Filofax Original Patent Black ( german )
[ Deko KW 26 ] Filofax Original Patent Black ( german )
Published: 2016/06/28
Channel: filolauli_
Kulturtipps kw26
Kulturtipps kw26
Published: 2017/06/28
Channel: M4 TV
Filofax Wochenedeko KW 26 2016 | MartasPlanner
Filofax Wochenedeko KW 26 2016 | MartasPlanner
Published: 2016/06/26
Channel: Martas Planner
DAX Analyse in 3 Minuten KW26   DAX im Chillmodus, aber wie lange noch?
DAX Analyse in 3 Minuten KW26 DAX im Chillmodus, aber wie lange noch?
Published: 2017/06/23
Channel: Christian Schlegel
MEMA TV - KW 26 - Kanditaten  Nationalratswahlen ÖVP  WK 4
MEMA TV - KW 26 - Kanditaten Nationalratswahlen ÖVP WK 4
Published: 2017/06/27
Channel: MEMA TV
FIFA 13 - Tore der Woche - KW 26
FIFA 13 - Tore der Woche - KW 26
Published: 2013/06/29
Channel: EA - Electronic Arts (deutsch)
SL News KW26
SL News KW26
Published: 2017/06/24
Channel: Die Villa
Filofaxing KW 26
Filofaxing KW 26
Published: 2016/06/26
Channel: berlinermelodie
Wochenausblick 39. KW. 26.-30.09.2016
Wochenausblick 39. KW. 26.-30.09.2016
Published: 2016/09/26
Channel: Markttechnik erfolgreich handeln Mario Lüddemann
KW 26 - 60 Sekunden aus der Politikredaktion
KW 26 - 60 Sekunden aus der Politikredaktion
Published: 2017/06/28
Channel: idowa
SinsheimJournal KW26
SinsheimJournal KW26
Published: 2016/07/03
Channel: Sinsheim TV
WoW Weekly - KW 26 (2016) | PvP Q&A, Legion Comic und mehr!
WoW Weekly - KW 26 (2016) | PvP Q&A, Legion Comic und mehr!
Published: 2016/07/03
Channel: WoW Guides und News - MMOZone
+++ Plan with me ++ Filofax KW 26 - 2017 +++
+++ Plan with me ++ Filofax KW 26 - 2017 +++
Published: 2017/06/20
Channel: Do what you Love
LT Tipp KW26   2014
LT Tipp KW26 2014
Published: 2014/10/13
Channel: buschminton
LT Tipp KW26 2016
LT Tipp KW26 2016
Published: 2016/06/22
Channel: buschminton
KW26 Acer Week FR
KW26 Acer Week FR
Published: 2017/06/26
Channel: Interdiscount
Gebärde der Woche "Arbeitsprobe" KW 26
Gebärde der Woche "Arbeitsprobe" KW 26
Published: 2017/06/26
Channel: stiftung st. franziskus heiligenbronn
Achensee Wochenwetter und Tipps von 28. Juni bis 4. Juli (KW26/2016)
Achensee Wochenwetter und Tipps von 28. Juni bis 4. Juli (KW26/2016)
Published: 2016/06/27
Channel: Achensee - Tirols Sport & VitalPark
Wochendeko KW 26/2016
Wochendeko KW 26/2016
Published: 2016/06/26
Channel: Ines Plannergirl
2017 筑波 1Lap On Bord from Winter Test Kazuki Watanabe #KW26 With RS ITOH
2017 筑波 1Lap On Bord from Winter Test Kazuki Watanabe #KW26 With RS ITOH
Published: 2017/01/17
Channel: Kazuki Watanabe
Wir in Esslingen 2015. Sendung KW 26
Wir in Esslingen 2015. Sendung KW 26
Published: 2015/06/25
Channel: Regio TV Stuttgart Filmproduktion
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WIKIPEDIA ARTICLE

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An array of KW-26s

The TSEC/KW-26, code named ROMULUS, (in 1966 the machine based encryption system was not code-named "Romulus," rather the code-name was "Orion," at least in the US Army's variant) was an encryption system used by the U.S. Government and, later, by NATO countries. It was developed in the 1950s by the National Security Agency (NSA) to secure fixed teleprinter circuits that operated 24 hours a day. It used vacuum tubes and magnetic core logic, replacing older systems, like SIGABA and the British 5-UCO, that used rotors and electromechanical relays.

A KW-26 system (transmitter or receiver) contained over 800 cores and approximately 50 vacuum-tube driver circuits, occupying slightly more than one half of a standard 19-inch rack. Most of the space in the rack and most of the 1 kW input power were required for the special-purpose vacuum tube circuits needed to provide compatibility with multiple input and output circuit configurations. The military services' requirements for numerous modes and speeds significantly increased costs and delayed delivery. NSA says it is doubtful that more than three or four of the possible configurations were ever used.

The KW-26 used an NSA-developed encryption algorithm based on shift registers. The algorithm produced a continuous stream of bits that were xored with the five bit Baudot teleprinter code to produce ciphertext on the transmitting end and plaintext on the receiving end. In NSA terminology, this stream of bits is called the key. The information needed to initialize the algorithm, what most cryptographers today would call the key, NSA calls a cryptovariable. Typically each KW-26 was given a new cryptovariable once a day.

KW-26 model C; the receiver is at the top, the transmitter at the bottom. Card reader is in upper right of each unit.

NSA designed a common fill device (CFD), for loading the cryptovariable. It used a Remington Rand (UNIVAC) format punched card (45 columns, round holes). The operator inserted the daily key card into the CFD and closed the door securely, locking the card in place. Decks of cards were created by NSA and sent by courier. The cards were strictly accounted for.

Because the KW-26 used a stream cipher, if the same key card was ever used twice, the encryption could be broken. To prevent re-use, the card was automatically cut in half upon reopening the CFD. As the units aged, the card reader contacts became less dependable, and operators resorted to various tricks, such as hitting the card reader cover with a screwdriver, to get them to work properly. Card readers were cleaned and the spring loading of the contacts checked as part of the routine maintenance of the device.

Because the KW-26 sent a continuous stream of bits, it offered traffic-flow security. Someone intercepting the ciphertext stream had no way to judge how many real messages were being sent, making traffic analysis impossible. One problem with the KW-26 was the need to keep the receiver and transmitter units synchronized. The crystal controlled clock in the KW-26 was capable of keeping both ends of the circuit in sync for many hours, even when physical contact was lost between the sending and receiving units. This capability made the KW-26 ideally suited for use on unreliable HF radio circuits. However, when the units did get out of sync, a new key card had to be inserted at each end. The benefit of traffic-flow security was lost each time new cards were inserted. In practice, operational protocol led to the cards being replaced more often than was desirable to maintain maximum security of the circuit. This was especially so on radio circuits, where operators often changed the cards many times each day in response to a loss of radio connectivity. In any case, it was necessary to change the cards at least once per day to prevent the cypher pattern from repeating.

Early KW-26 units protected the CRITICOMM network, used to protect communications circuits used to coordinate signals intelligence gathering. The initial production order for this application, awarded to Burroughs in 1957, was for 1500 units. Other services demanded KW-26's and some 14000 units were eventually built, beginning in the early 1960s, for the U.S. Navy, Army, Air Force, Defense Communications Agency, State Department and the CIA. It was provided to U.S. allies as well.

When the USS Pueblo was captured by North Korea in 1968, KW-26's were on board. In response, the NSA had modifications made to other units in the field, presumably changing the crypto algorithm in some way, perhaps by changing the shift register feedback taps. Starting in the mid-1980s, the KW-26 system was decommissioned by NSA, being replaced by the more advanced solid-state data encryptor, TSEC/KG-84.

See also[edit]

External links[edit]

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