About: 5-UCO

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The 5-UCO (5-Unit Controlled) was an on-line one-time tape Vernam cipher encryption system developed by the UK during World War II for use on teleprinter circuits. During the 1950s, it was used by the UK and US for liaison on cryptanalysis. Colonel G. ff Bellairs was awarded sums totalling £2250 for the development of 5-UCO, £750 in 1943, and £1,500 in 1960. Dr G. Timms and Mr D. C. Harwood were also awarded £1,000 for work on random tape for 5-UCO.

Attributes	Values
rdf:type	yago:Artifact100021939 yago:Device103183080 yago:Instrumentality103575240 yago:Object100002684 yago:PhysicalEntity100001930 yago:Whole100003553 yago:WikicatEncryptionDevices
rdfs:label	5-UCO (de) 5-UCO (en)
rdfs:comment	Die 5-UCO (abgekürzt von 5-Unit Controlled, deutsch: „Fünf Einheiten gesteuert“; auch BID/30) war eine britische Schlüsselmaschine, die zur Verschlüsselung das kryptographisch sichere Einmalschlüssel-Verfahren (englisch One-Time Pad, kurz: OTP) nutzte. (de) The 5-UCO (5-Unit Controlled) was an on-line one-time tape Vernam cipher encryption system developed by the UK during World War II for use on teleprinter circuits. During the 1950s, it was used by the UK and US for liaison on cryptanalysis. Colonel G. ff Bellairs was awarded sums totalling £2250 for the development of 5-UCO, £750 in 1943, and £1,500 in 1960. Dr G. Timms and Mr D. C. Harwood were also awarded £1,000 for work on random tape for 5-UCO. (en)
dcterms:subject	Encryption devices
Wikipage page ID	1198691 (xsd:integer)
Wikipage revision ID	981554689 (xsd:integer)
Link from a Wikipage to another Wikipage	Mercury (cipher machine) United Kingdom United States One-time pad Rockex Encryption devices KW-26 Teleprinter National Security Agency World War II Vernam cipher Traffic-flow security Army Security Agency
Link from a Wikipage to an external page	http://www.cryptomuseum.com/crypto/uk/5uco/
sameAs	5-UCO 5-UCO 5-UCO 5-UCO 5-UCO
dbp:wikiPageUsesTemplate	dbt:Inflation dbt:Cryptography_navbox
has abstract	The 5-UCO (5-Unit Controlled) was an on-line one-time tape Vernam cipher encryption system developed by the UK during World War II for use on teleprinter circuits. During the 1950s, it was used by the UK and US for liaison on cryptanalysis. 5-UCO was fully synchronous, and therefore could be electrically regenerated on tandem high frequency (HF) radio links (i.e. one link connected to the next). It could operate directly with commercial circuits. The system also provided traffic-flow security (TFS). Another feature of the 5-UCO was that the receiving operator could maintain synchronisation if the path delay suddenly changed by "walking up and down" the key tape (one character at a time or one bit at a time). This procedure avoided the cumbersome task of a restart. 5-UCO required large amounts of key tape to operate on a continual basis. In 1960, supplying the key tape for a single 5-UCO in continuous use cost £5000 per year (equivalent to £116,000 in 2019). In the US, the logistical problems involved in the generation, supply and destruction of sufficient quantities of key tape limited its use to only the most sensitive traffic. The Army Security Agency sought to develop a replacement, an effort later taken over by the newly formed National Security Agency and resulting in the fielding of the KW-26 (ROMULUS) system. Colonel G. ff Bellairs was awarded sums totalling £2250 for the development of 5-UCO, £750 in 1943, and £1,500 in 1960. Dr G. Timms and Mr D. C. Harwood were also awarded £1,000 for work on random tape for 5-UCO. (en) Die 5-UCO (abgekürzt von 5-Unit Controlled, deutsch: „Fünf Einheiten gesteuert“; auch BID/30) war eine britische Schlüsselmaschine, die zur Verschlüsselung das kryptographisch sichere Einmalschlüssel-Verfahren (englisch One-Time Pad, kurz: OTP) nutzte. (de)
gold:hypernym	System
prov:wasDerivedFrom	wikipedia-en:5-UCO?oldid=981554689&ns=0
page length (characters) of wiki page	2496 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:5-UCO
is Link from a Wikipage to another Wikipage of	5UCO Mercury (cipher machine) One-time pad NSA encryption systems Rockex Gilbert Vernam KW-26 Known-plaintext attack SIGTOT 5 UCO BID/30 BID 30
is Wikipage redirect of	5UCO 5 UCO BID/30 BID 30
is foaf:primaryTopic of	wikipedia-en:5-UCO

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