David Kris sat down with David Hatch, the senior historian at the U.S. National Security Agency. They discussed Project VENONA, an incredibly significant intelligence program involving encrypted Soviet messages that began during World War II and went on for many years thereafter. It's a story full of unusual events and interesting lessons about intelligence and counterintelligence and spy vs. spy. There's also a little review of encryption—specifically, the risks of reusing one-time encryption pads—and a discussion of the declassification process of Project VENONA and why we can talk about the project at all.

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