The term "Black Chamber" can refer to a couple of different concepts, depending on the context in which it is used: 1. **Historical Context**: The "Black Chamber" refers to the Cipher Bureau, which was the first peacetime cryptanalytic organization in the United States, established during World War I. Led by Herbert O. Yardley, it operated from 1919 to 1929 and was responsible for decoding foreign diplomatic and military communications.
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