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FSB
Federal'naya Sluzhba Bezopasnosti – Rossiyskoy Federatsii - this page is a stub

FSB (Russian: ФСБ) is the current Federal Security Service of the Russian Federation, established on 12 April 1995 as the successor to the KGB. The agency is responsible for internal and border security, counter-intelligence, counter-terrorism and surveillance, and was established at the end of the Cold War, following the collapse of the Soviet Union in 1991. The FSB is mainly responsible for the internal security of the Russian state, whereas espionage and foreign operations are the responsibility of the Foreign Intelligence Service (SVR) and the Main Intelligence Directorate (GRU).

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Numbers Stations
One of the ways that are used by Russian intelligence services to send messages to intelligence officers and spies in foreign countries, is the so-called One-Way Voice Link (OWVL), also known as Numbers Stations: mysterious radio stations on the short wave radio band, that broadcast arrays of spoken numbers. Such stations were frequently spotted during the 1960s, 70s and 80s.

The number arrays represent coded messages that are generally encrypted by means of a One-Time Pad (OTP) cipher. Most Numbers Stations have disappered after the end of the Cold War, but some are still active today. Although most of them are operated by the SVR and the GRU, they are often (wrongly) attributed to the FSB (and previously to their predecessor, the KGB). The following Russian Numbers Stations were still active from Russia in 2019:

References
  1. Wikipedia, FSB
    Retreived November 2019
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Crypto Museum. Created: Sunday 24 November 2019. Last changed: Sunday, 24 November 2019 - 17:50 CET.
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