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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?

BREAKING NEWS Last weekend, we solved the 340 and submitted it to the FBI. They have confirmed the solution. Authorities have spent the time since then making the appropriate notifications to the victims’ families. Now that the notification process is complete, we are announcing the solution in...

The National Cryptologic Museum has been closed due to the pandemic, so they've been doing a series of online educational events. They invited me to give a lecture about the Zodiac ciphers. Check it out in my latest episode of Let's Crack Zodiac: Topics include Zodiac's crimes, letters...

Join me for a deep dive into the Zodiac Killer's first mysterious cipher, as told through a combination of newspaper articles, police reports, FBI documents and books. Learn about Zodiac's crimes, his taunting letters, the mysterious cryptogram he sent to local newspapers, all the efforts to...

Episode 2 of "Let's Crack Zodiac" is out! In this episode, let's take a look at some evidence that Zodiac's 2nd unsolved cipher might be hiding a real message.

I created a new video series on Youtube. It's called "Let's Crack Zodiac". True crime meets classical cryptography. Episode 1: Graysmith Almost 35 years ago, Robert Graysmith published his blockbuster book, "Zodiac", and claimed to solve a famous unsolved Zodiac Killer cipher. But did he...

Here is an article about finding words in the puzzle BTK sent to a Kansas TV station in 2004: http://www.zodiackillerciphers.com/?p=454

I had to re-install the Zodiac Ciphers wiki because the old one was being abused by spammers. While I was at it, I launched a new domain to serve as a front end for news and resources surrounding the ciphers: http://www.zodiackillerciphers.com/ Come by, have a look, read about some of my...