Canadian Security Intelligence Service
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Artifacts Collection
Tradecraft Artifacts
Communications devices
High-speed radio transmission (burst mode) decoder
This item was used in Canada by the agent of a foreign intelligence service. Encrypted messages were sent from abroad in very short bursts via short-wave radio and recorded by the agent on a tape recorder. The tape would then be fed through this device which converted the message to five-digit code. This enabled the agent to decrypt the message through the use of a One-Time-Pad.
This high-speed radio transmission decoder was used by a foreign agent to decrypt a message.
