Government Communications Headquarters

Government Communications Headquarters (GCHQ) is a British signals intelligence (sigint) agency.
==History==
===Government Code & Cypher School===
The Government Code & Cypher School (GC&CS) was founded in 1919 as Britain's first integrated cryptographic agency.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.xvii.
GC&CS was redesignated the London Signals Intelligence Centre in 1946, following a move from its wartime centre at Bletchley Park to Eastcote.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.xvii.
===GCHQ===
The organisation formally took the name Government Communications Headquarters (GCHQ), previously in use as a cover name, on 1 November 1948.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.xvii.
===ABC Trial===
GCHQ's activities received little publicity until 1976, when Duncan Campbell probed its activities in Cyprus for Time Out magazine. The subsequent prosecution under the Official Secrets Act became known as the ABC Trial.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.8.
===Geoffrey Prime affair===
A former GCHQ employee Geoffrey Prime was convicted of spying for the KGB in 1982.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, pp.379-380.
===The Zircon project===
British dependence on American satellites during the Falklands War led GCHQ director Brian Tovey to propose a British spy satellite, Zircon.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.442.
In early 1987, BBC director general Alasdair Milne, banned a documentary by Duncan Campbell, who had discovered the existence of the Zircon project and the fact that Parliament knew nothing about it.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.459.
By 1988, the British government opted instead to pay £500 million to guarantee access to American satellites.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.460.
===Union ban===
Trade unions were bannned from GCHQ by the Thatcher government in January 1984, prompting a long-running dispute.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.416.
===Al-Saadi case===
In April 2015, GCHQ was ordered to destroy legally privileged communications it unlawfully collected from a Libyan rendition victim, Sami al-Saadi.Alan Travis, GCHQ conducted illegal surveillance, investigatory powers tribunal rules, theguardian.com, 29 April 2015.
==Personnel and Organisation==
===Directors===
*Sir Edward Travis - 1944-1952
*Sir Eric Jones - 1952-1960
*Sir Clive Loehnis - 1960-64
*Sir Leonard Hooper - 1965-1973
*Sir Arthur Bonsall - 1973-1978
*Sir Brian Tovey - 1978-1983
*Sir Peter Marychurch - 1983-1989
*Sir John Adye - 1989-1996
*Sir David Omand - 1996-1997
*Sir Kevin Tebbit - 1998
*Sir Francis Richards - 1998-2003 
*Sir David Pepper - 2003-2008
*Sir Iain Lobban - 2008-2014, appointed in April 2015 as a financial crime investigator for Standard Chartered
*Robert Hannigan - 2014Robert Hannigan is appointed as new Director of GCHQ, gov.uk, 15 April 2014.
*Sir Jeremy Fleming (2017–2023)
*Anne Keast-Butler (2023–Present)
===Security mission===
As well as a mission to gather intelligence, GCHQ has for a long time had a corresponding mission to assist in the protection of the British government's own communications. When the Government Code and Cypher School (GC&CS) was created in 1919, its overt task was providing security advice. GC&CS's Security section was located in Mansfield College, Oxford during the Second World War.
In April 1946, GC&CS became GCHQ, and the now GCHQ Security section moved from Oxford to join the rest of the organisation at Eastcote later that year.
===LCSA===
From 1952 to 1954, the intelligence mission of GCHQ relocated to Cheltenham; the Security section remained at Eastcote, and in March 1954 became a separate, independent organisation: the London Communications Security Agency (LCSA), which in 1958 was renamed to the London Communications-Electronic Security Agency (LCESA).
In April 1965, GPO and MOD units merged with LCESA to become the Communications-Electronic Security Department (CESD).
===CESG===
In October 1969, CESD was merged into GCHQ and becoming Communications-Electronic Security Group (CESG).
In 1977 CESG relocated from Eastcote to Cheltenham.
CESG continued as the UK National Technical Authority for information assurance, including cryptography. CESG did not manufacture security equipment, but worked with industry to ensure the availability of suitable products and services, while GCHQ itself funded research into such areas, for example to the Centre for Quantum Computation at Oxford University and the Heilbronn Institute for Mathematical Research at the University of Bristol.
In the 21st century, CESG ran a number of assurance schemes such as CHECK, CLAS, Commercial Product Assurance (CPA) and CESG Assisted Products Service (CAPS).
====Public key encryption====
In 1970 the concept for public-key encryption (public key infrastructure) was developed and proven by GCHQ's James H. Ellis. Ellis lacked the number theory skills required to build a workable system. In 1974 GCHQ mathematician Clifford Cocks had developed a workable public key cryptography algorithm and a workable PKI system. Cocks's system was not available in the public domain until it was declassified in 1997. (Originally published in The Sunday Telegraph)
By 1997 broader public key cryptography commercial technologies had been independently developed and had become well established, in areas such as email security, digital signatures, and TLS (a fundamental TCP/IP security component) etc. Most notably in 1977 the RSA algorithm had been developed (equivalent to Cocks's system) and by 1997 was extremely well established.
===NCSC===
In 2016, the National Cyber Security Centre was established under GCHQ but located in London, as the UK's authority on cybersecurity. It absorbed and replaced CESG as well as activities that had previously existed outside GCHQ: the Centre for Cyber Assessment (CCA), Computer Emergency Response Team UK (CERT UK) and the cyber-related responsibilities of the Centre for the Protection of National Infrastructure (CPNI).
===SIGINT Missions===
According to a diagram of GCHQ's 1998 organisation in Richard Aldrich's book on the agency, SIGINT Missions was one of four major divisions of its work under the corporate board.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565. it encompassed:
*Maths and Cryptanalysis.
*IT and Computer Services.
*Linguists and Translation.
*Intelligence Analysis Unit & Open Source Joint Working Group.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565.
===Enterprise===
According to Aldrich, Enterprise was a major division of GCHQ's 1998 organisation under the corporate board.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565. It included:
*Applied Research and Emerging Technologies.
*Corporate Knowledge and Information Services.
*Commercial Supplier Relationships.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565.
*Biometrics.
===Corporate Management===
According to Aldrich, Corporate management was a major division of GCHQ's 1998 organisation under the corporate board.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565. It encompassed:
*Enterprise Resource Planning System.
*Human Resources (Broadreach).
*Internal audit.
*SINEWS Architecture Team.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565.
===Communications-Electronics Security Group===
According to Aldrich, the Communications-Electronic Security Group was a major division of GCHQ's 1998 organisation under the corporate board.Richard J. Aldrich, GCHQ: The Uncensored Story of Britain's Most Secret Intelligence Agency, HarperPress, 2010, p.565.
===Miscellaneous Units and Projects===
It is not known where or whether the following units and projects fit within Aldrich's schema:
*Global Telecoms Exploitation (GTE)
*Joint Threat Research and Intelligence Group
*Human Science Operations Cell
*Mastering the Internet (MTI) 
*Tempora
*Special Source Exploitation
*Cyber Defence Operations, formerly Network Defence Intelligence and Security Team
*Internet Operations Centre (INOC)
*Joint Cyber Unit
*National Cyber Security Centre
==Website==
http://www.gchq.gov.uk/
==External resources==
*Duncan Campbell and Mark Hosenball, The Eavesdroppers, Time Out, 1976, archived at duncancampbell.org 
*Nick Hopkins, UK gathering secret intelligence via covert NSA operation, guardian.co.uk, 7 June 2013.
*Richard Norton-Taylor, Intelligence-gathering by British state out of control, guardian.co.uk, 11 June 2013.
*Ewen MacAskill, Nick Davies, Nick Hopkins, Julian Borger and James Ball, GCHQ intercepted foreign politicians' communications at G20 summits, The Guardian, 17 June 2013.
*Ewen MacAskill, Julian Borger, Nick Hopkins, Nick Davies and James Ball, GCHQ taps fibre-optic cables for secret access to world's communications, guardian.co.uk, 21 June 2013.
*Nick Davies, MI5 feared GCHQ went 'too far' over phone and internet monitoring, The Observer, 22 June 2013.
*Christian Stöcker, GCHQ Surveillance: The Power of Britain's Data Vacuum, Spiegel Online, 7 July 2013.
*James Cusick, GCHQ spying programme: Spy watchdog ‘is understaffed and totally ineffective’, Independent, 14 July 2013.
*Nick Hopkins and Julian Borger, Exclusive: NSA pays £100m in secret funding for GCHQ, The Guardian, 1 August 2013.
*Nick Hopkins, Julian Borger and Luke Harding, Exclusive: NSA pays £100m in secret funding for GCHQ, The Guardian, 1 August 2013.
*Duncan Campbell, Oliver Wright, James Cusick, Kim Sengupta, Exclusive: UK’s secret Mid-East internet surveillance base is revealed in Edward Snowden leaks, Independent, 23 August 2013.
*John Goetz, Hans Leyendecker and Frederik Obermaier, British Officials Have Far-Reaching Access To Internet And Telephone Communications, Süddeutsche Zeitung International, 28 August 2013.
*James Ball, Leaked memos reveal GCHQ efforts to keep mass surveillance secret, The Guardian, 25 October 2013.
*Quantum Spying: GCHQ Used Fake LinkedIn Pages to Target Engineers, Spiegel Online, 11 November 2013.
*James Ball, GCHQ and NSA targeted charities, Germans, Israeli PM and EU chief, The Guardian, 20 December 2013.
==Notes==
category:spooksCategory:GCHQ