- A Black Chamber is a facility, often located in post offices, for mail and message interception, decoding, and decryption. Black Chambers began in Russia and reached their apogee in East Germany, where the Stasi read virtually all international and domestic correspondence. For the Okhrana and Ministry of Foreign Affairs, the Black Chamber provided diplomatic cables and thousands of pieces of raw intelligence from suspected dissidents and radicals. The Okhrana model was improved by the Cheka and its successor services.
Historical dictionary of Russian and Soviet Intelligence. Robert W. Pringle. 2014.
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