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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
Neue KINO TRAILER 2017 German Deutsch (KW 26)
Neue KINO TRAILER 2017 German Deutsch (KW 26)
Published: 2017/07/02
Channel: FilmSelect
Christoph Hörstel zur Lage KW26
Christoph Hörstel zur Lage KW26
Published: 2017/06/30
Channel: Christoph Hörstel
LAVOR 고압세척기 KW26 사용영상 160bar
LAVOR 고압세척기 KW26 사용영상 160bar
Published: 2016/03/18
Channel: 라보코리아
Christoph Hoerstel zur Lage   KW 26
Christoph Hoerstel zur Lage KW 26
Published: 2016/07/02
Channel: Christoph Hörstel
MEMA TV - KW 26 - Panorama 26/2017
MEMA TV - KW 26 - Panorama 26/2017
Published: 2017/06/29
Channel: MEMA TV
Bitcoin Chartanalyse KW 26 2017
Bitcoin Chartanalyse KW 26 2017
Published: 2017/07/02
Channel: Ro Finance
Best of DrachenLord | KW 26 [Haider Cut]
Best of DrachenLord | KW 26 [Haider Cut]
Published: 2016/07/03
Channel: Lutschkind
kw26
kw26
Published: 2017/02/01
Channel: Animansha
Filofax Wochendeko KW 26 / 2017 Pippi Langstrumpf
Filofax Wochendeko KW 26 / 2017 Pippi Langstrumpf
Published: 2017/06/21
Channel: Püppilotta Schokominza
Wochenübersicht Bullet Journal | KW 26 | Deutsch
Wochenübersicht Bullet Journal | KW 26 | Deutsch
Published: 2017/06/17
Channel: Janoschka La
WoW Weekly - KW 26 (2017) | ToS World First Rennen, Patch 7.3 PTR Build und mehr!
WoW Weekly - KW 26 (2017) | ToS World First Rennen, Patch 7.3 PTR Build und mehr!
Published: 2017/07/02
Channel: WoW Guides und News - MMOZone
#KW 26 2017 - Juni verregnet
#KW 26 2017 - Juni verregnet
Published: 2017/07/01
Channel: Optiontrader Goes Pro
Infokanal St. Michael - KW 26 - 29.06.2017
Infokanal St. Michael - KW 26 - 29.06.2017
Published: 2017/06/29
Channel: Infokanal St. Michael i.O.
Wochendekoration KW 26/2017
Wochendekoration KW 26/2017
Published: 2017/07/16
Channel: dieseNachteule
Kanal3 Obersteiermark KW 26 2017
Kanal3 Obersteiermark KW 26 2017
Published: 2017/06/22
Channel: kanal3tvregional
Generator Diesel Silent Krisbow 5 kVA (KW26-08)
Generator Diesel Silent Krisbow 5 kVA (KW26-08)
Published: 2014/08/11
Channel: Ranggasatya Akbar
Filofax Personal Wochendeko KW 26
Filofax Personal Wochendeko KW 26
Published: 2017/07/09
Channel: Frau Anne
FIFA 13 - Tore der Woche - KW 26
FIFA 13 - Tore der Woche - KW 26
Published: 2013/06/29
Channel: EA - Electronic Arts (deutsch)
Neue KINO TRAILER 2017 German Deutsch (KW 29)
Neue KINO TRAILER 2017 German Deutsch (KW 29)
Published: 2017/07/23
Channel: FilmSelect
Lavor KW 26 - смываем колпак.mp4
Lavor KW 26 - смываем колпак.mp4
Published: 2010/06/04
Channel: hmelkow
Filofaxing KW 26
Filofaxing KW 26
Published: 2016/06/26
Channel: berlinermelodie
review KW 26 / 2016 (Folge 11)
review KW 26 / 2016 (Folge 11)
Published: 2016/07/01
Channel: OK Kaiserslautern
Neue KINO TRAILER 2016 German Deutsch (KW 26)
Neue KINO TRAILER 2016 German Deutsch (KW 26)
Published: 2016/07/03
Channel: FilmSelect
Wochenrückblick KW 26 2017: Intel irrt, Internet infiziert, iPhone illuminiert
Wochenrückblick KW 26 2017: Intel irrt, Internet infiziert, iPhone illuminiert
Published: 2017/07/01
Channel: GolemDE
Staufenbiel Hyperion Hahnenmoos KW 26 2017
Staufenbiel Hyperion Hahnenmoos KW 26 2017
Published: 2017/07/04
Channel: Wobisch70
Uniplaner KW 26
Uniplaner KW 26
Published: 2016/07/02
Channel: berlinermelodie
Mini SNES Alternativen, Trolle versauen Gaming-Event | Gamesworld Weekly News Show - KW26
Mini SNES Alternativen, Trolle versauen Gaming-Event | Gamesworld Weekly News Show - KW26
Published: 2017/07/01
Channel: Gamesworld
033 Plan with me: KW 26
033 Plan with me: KW 26
Published: 2017/07/03
Channel: RiSaDem 92
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
KW26 Acer Week DE
KW26 Acer Week DE
Published: 2017/06/26
Channel: Interdiscount
MEMA TV - KW 26 - Rennfelder Kirtag 2017
MEMA TV - KW 26 - Rennfelder Kirtag 2017
Published: 2017/07/02
Channel: MEMA TV
katholisch1.tv - das Magazin vom 02.07.2017 (KW 26/2017)
katholisch1.tv - das Magazin vom 02.07.2017 (KW 26/2017)
Published: 2017/07/03
Channel: katholisch1tv
Felix Kröcher LIVE 24.06.2015 @ sunshine live (KW26)
Felix Kröcher LIVE 24.06.2015 @ sunshine live (KW26)
Published: 2015/06/25
Channel: Alexander Stöshel
Killing Floor 2 Weekly - 2 - KW 26 - Mini Terror | German | BIG
Killing Floor 2 Weekly - 2 - KW 26 - Mini Terror | German | BIG
Published: 2017/06/29
Channel: ButcherInGame
SPORT-Trading im Juni 2016 - Die Wochen-Performance KW 26
SPORT-Trading im Juni 2016 - Die Wochen-Performance KW 26
Published: 2016/07/05
Channel: SPORT-Trader
Wochendekoration KW 26
Wochendekoration KW 26
Published: 2017/06/25
Channel: filofee_
Wochendeko KW 26/2016
Wochendeko KW 26/2016
Published: 2016/06/26
Channel: Ines Plannergirl
KOSTENLOSER Börsenbrief | Burger für Bitcoin | Blockchain-Verband | KW 26
KOSTENLOSER Börsenbrief | Burger für Bitcoin | Blockchain-Verband | KW 26
Published: 2017/07/02
Channel: BTC-ECHO | Bitcoin News & Tutorials
BLU-RAY / DVD Update KW 26 ( vor dem Sabbat-Monat )
BLU-RAY / DVD Update KW 26 ( vor dem Sabbat-Monat )
Published: 2016/07/12
Channel: Cinemanuel
AndroidPIT Wochenrückblick (KW 26)
AndroidPIT Wochenrückblick (KW 26)
Published: 2017/07/01
Channel: ANDROIDPIT de
SinsheimJournal KW26
SinsheimJournal KW26
Published: 2016/07/03
Channel: Sinsheim TV
Neues aus Gera für Thüringen (KW 26/2017)
Neues aus Gera für Thüringen (KW 26/2017)
Published: 2017/06/28
Channel: labor14 - Thüringer Lernsender
LT Tipp KW26   2014
LT Tipp KW26 2014
Published: 2014/10/13
Channel: buschminton
Weekly Yugioh News KW 26
Weekly Yugioh News KW 26
Published: 2017/07/01
Channel: E-man9595
Energie-Impuls KW 26
Energie-Impuls KW 26
Published: 2017/06/20
Channel: SchmidtColleg
OpelSommerGrillen 872 kw26 NEU
OpelSommerGrillen 872 kw26 NEU
Published: 2017/06/28
Channel: M4 TV
Drachenlord zock, worst of KW 26
Drachenlord zock, worst of KW 26
Published: 2017/07/01
Channel: Abc Def
Filofax Wochendeko KW 26
Filofax Wochendeko KW 26
Published: 2016/06/28
Channel: Yourshadowstouch
Facebook Partei-Vergleich KW 26 mit KW 25 zur Bundestagswahl 2017
Facebook Partei-Vergleich KW 26 mit KW 25 zur Bundestagswahl 2017
Published: 2017/07/04
Channel: Moritz Beck
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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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