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Opto Voice Stasi
Practical application of LEDs
- this page is a stub
Anwendung von Lumineszenzdioden (ALD), was a multi-year research
project into the practical application of light-emitting diodes (LEDs),
carried out between July 1968 and March 1969 by the
Institut für nachrichtentechnik (INT)
– the Information Technology Institute – in East-Berlin (DDR).
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The results were shared with the
Ministerium für Staatssicherheit (MfS),
the repressive security service of the DDR
— the Stasi, where they were used for covert wireless communication
[3][A].
Although INT was responsible for the research and in some cases
also for the development of actual devices — a good example is the
ALD-3K —
the production was done elsewhere by (or on behalf of) the Stasi,
whilst the practical use of the equipment was kept outside INT's view [3].
➤ Read the final report
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ALD devices on this website
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Document obtained from BStU [2] and kindly supplied
by Detlev Vreisleben [1].
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Full name: Bundesbeauftragte für die Unterlagen des Staatssicherheitsdienstes
der ehemaligen Deutschen Demokratischen Republik
(DDR) —
Federal Commissioner for the Records of the
State Security Service
of the former German Democratic Republic (GDR) —
officially abbreviated to BStU.
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Document obtained from BStU [2] and kindly supplied
by Detlev Vreisleben [1].
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© Crypto Museum. Created: Saturday 11 December 2021. Last changed: Saturday, 11 December 2021 - 13:59 CET.
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