David Oranchak was born in 1974, the same year that the Zodiac Killer wrote his final message to the world. 46 years later, David would be a part of a small team of code-breaking enthusiasts who cracked the Zodiac 340 cipher. For decades, the message eluded even the best cryptanalysts from across the intelligence field.
David joined Andrew in the studio this week to discuss how he, along with mathematician Sam Blake and programmer Jarl Van Eycke, finally put an answer to the puzzle after 51 years. They talk through the methods Dave’s team used to decrypt the 340, how the cipher went unsolved for so long, and how it felt to read the words of a serial killer. Tune in to learn more about one of the most amazing feats of cryptanalysis in our modern age.
And…
To learn even more and follow along with the journey to solve the Z340, check out Dave’s KZitem channel. Make sure to watch his video on cracking the historical ciphers from Mary, Queen of Scots - A piece of intelligence history we cover here at the International Spy Museum!
Quotes of the Week
“It felt like we had gotten a brand new letter from the Zodiac Killer. You know, the case had been dormant for so long … We started to see the message coming through, it was like he was back to life so to speak, he was talking to us again after so many years of not saying anything. So that was kind of eerie to kind of hear the voice of a serial killer.” - David Oranchak.
Dive deeper into this episode with additional resources:
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HOST - Dr. Andrew Hammond, Ph.D. is Historian & Curator at the International Spy Museum, home of the world's preeminent collection of intelligence-related artifacts. Previous chapters have included seven years in the RAF, Public Humanities at the 9/11 Museum in NYC, Fellowships here, there, and everywhere, and academia. He is author of the forthcoming book: "Struggles for Freedom": Afghanistan & US Foreign Policy Since 1979. He loves bialys.
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The International Spy Museum (SPY) is an independent nonprofit museum which documents the tradecraft, history, and contemporary role of espionage. It holds the largest collection of international espionage artifacts on public display.
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