Recent content by doranchak

Back in 2017 I met Dr. Ryan Garlick, a computer science professor from the University of North Texas. After the Zodiac Killer's 340 cipher was solved, he developed an intriguing solution to Zodiac's third cipher, the so-called Z13 cipher. In my latest episode, Dr. Garlick reveals his solution...

The Zodiac Killer’s first cryptograms baffled law enforcement, but not Donald and Bettye Harden. Now, decades later, lost letters from Donald to historian David Kahn have surfaced, revealing new details about their legendary codebreaking. Watch my latest YouTube episode for an exclusive look at...

Before the police, before the FBI—two everyday citizens, Donald and Bettye Harden, were the first to crack the Zodiac Killer’s infamous ciphers. Now, newly discovered letters from Donald shed fresh light on how they did it. Join me in my latest YouTube episode to witness the Hardens’ achievement...

Three years ago, the Casebreakers made a huge claim that Gary Francis Poste was the Zodiac Killer. Their evidence? Much of it came from TV news anchor Dale Julin, who uncovered hidden messages in the Zodiac’s cryptic correspondences—messages he claimed pointed straight to Poste. But how did...

New episode! A handful of Zodiac-related updates, followed by a presentation I gave for a school career day back in February: “What the Zodiac Serial Killer Taught Me About Careers In Codebreaking”

Was the Unabomber the Zodiac Killer? Some people believe they are the same person. Learn about the Unabomber's codes and ciphers in the latest episode of “Let’s Crack Zodiac”.

Zodiac liked to mail ciphers, but did you know some people tried to make their own for him to read? Learn more about this and other ways people tried to catch the Zodiac Killer in the latest episode of Let's Crack Zodiac.

I got to hang out with FBI codebreakers at a forensic sciences conference in Seattle! We gave a seminar. One of the FBI codebreakers talked about the history of the FBI codebreaking unit, and I talked about the process of solving the Zodiac 340 cipher. Amazing and informative conference, full...

The Riddler in the upcoming Batman movie is based on the Zodiac Killer. This new episode of Let’s Crack Zodiac started as a quick look at how the new Riddler and his ciphers compare to Zodiac, but then turned into a deep dive into many topics: The Riddler in the real FBI case files...

A French engineer solved two more of Zodiac’s ciphers. Or did he? Watch this video to learn more about a recent attempt to crack Zodiac’s remaining unsolved ciphers.

A report on the recent news of an alleged breakthrough in the Zodiac case involving a new suspect. Let’s examine the evidence linking this suspect to the Zodiac crimes, including decipherments that use anagrams. Do anagrams reveal Zodiac’s secret plans and evidence?

Let’s Crack Zodiac: Episode 9 is out! In this episode, we explore some random topics related to the 340 cipher: - How close did others get to solving it? - Hidden clues: Are they real or fake? - How did Zodiac make his cipher key? - Crypto tools And some remaining mysteries about the cipher.

New Episode of Let's Crack Zodiac! Sam Blake tells the story of his huge success in helping to solve the baffling mystery of the Zodiac's 340 cipher. His talk is great proof that math and science can unwrap mysteries that were once thought to be unsolvable. Thanks very much to Sam for sharing...

Check out Mike Morford, creator of the new "Zodiac Speaking" podcast, who recently appeared in a live Zodiac Killer segment on the Today Show Extra in Australia. Here is the link to his new podcast: Zodiac Speaking

Did Zodiac inspire this scene from Training Day?