Rockex, or Telekrypton, was an offline
one-time tape
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is not smaller than the message being sent. In this technique, a plaintext is paired with a rand ...
Vernam cipher
Vernam is a surname. Notable people with the surname include:
*Charles Vernam (born 1996), English professional footballer
*Gilbert Vernam (1890–1960), invented an additive polyalphabetic stream cipher and later co-invented an automated one-time ...
machine known to have been used by
Britain
Britain most often refers to:
* The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands
* Great Britain, the largest island in the United King ...
and
Canada
Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
from 1943. It was developed by Canadian electrical engineer
Benjamin deForest Bayly Benjamin deForest "Pat" Bayly (June 20, 1903 – 1994) was a Canadian electrical engineer and a professor at the University of Toronto. During World War II he invented a cypher machine called the Rockex and handled communications at the secret int ...
, working during the war for
British Security Coordination
British Security Co-ordination (BSC) was a covert organisation set up in New York City by the British Secret Intelligence Service (MI6) in May 1940 upon the authorisation of the Prime Minister, Winston Churchill.
Its purpose was to investigate ...
.
"Rockex" was named after the
Rockefeller Center
Rockefeller Center is a large complex consisting of 19 commerce, commercial buildings covering between 48th Street (Manhattan), 48th Street and 51st Street (Manhattan), 51st Street in Midtown Manhattan, New York City. The 14 original Art Deco ...
,
[Louis Kruh, British intelligence in the Americas, ''Cryptologia'', April 2001] together with the tradition for naming British cipher equipment with the suffix "-ex" (e.g.
Typex).
In 1944 an improved Rockex II first appeared.
There were also a Mark III and Mark V. After the war it was used by British consulates and embassies until 1973, although a few continued in use until the mid-1980s.
[Exhibit card describing Rockex equipment in the "Enigma and Friends" exhibit at the ]Bletchley Park
Bletchley Park is an English country house and estate in Bletchley, Milton Keynes ( Buckinghamshire) that became the principal centre of Allied code-breaking during the Second World War. The mansion was constructed during the years following ...
museum, September 2006
After WW2 the Rockex machines and the code tapes were manufactured in great secrecy under the control of the
Secret Intelligence Service
The Secret Intelligence Service (SIS), commonly known as MI6 ( Military Intelligence, Section 6), is the foreign intelligence service of the United Kingdom, tasked mainly with the covert overseas collection and analysis of human intelligenc ...
(SIS), also known as MI6, at a small factory at Number 4 Chester Road, Borehamwood on the northern outskirts of London. To minimise the number of people who knew about the process, MI6's head of communications,
Brigadier Sir Richard Gambier-Parry, took out a personal lease on the factory buildings and employed people through the local labour exchange as an entirely private venture ostensibly unconnected with government. The end product was then sold to the government departments who used the machines. This was not discovered by the UK Treasury until 1951 who were most concerned that no form of financial auditing had ever been exercised over the organisation. The Treasury officials were eventually convinced that the factory needed to be treated as a special case and they allowed it to continue privately but with a special arrangement for top secret auditing (Natl Archives file T220/1444)
References
External links
Jerry Proc's page on RockexRockex on Crypto Museum website*
5-UCO
See also
*
Noreen
Noreen, or BID 590, was an off-line one-time tape cipher machine of British origin.
Usage
As well as being used by the United Kingdom, Noreen was used by Canada. It was widely used in diplomatic stations. According to the display note on a s ...
Encryption devices
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