Criminology

Check out “Criminology”, a fantastic podcast about the Zodiac Killer. I’m honored to be featured in Episode 11, in which we dissect the ciphers in more detail: http://criminology.libsyn.com/ep11-zodiac-ciphers-conversation Thanks, Morf and Mike Ferguson for inviting me to be a part…

Criminal codes and ciphers

A friend of mine teaches a Network Security course at a local community college and he invited me to give a talk about criminal codes and ciphers. Here is the video of the talk: Topics include the Unabomber, BTK Killer,…

Hands on Z408

Tom Voigt managed to gain access to the evidence room (presumably at SFPD) to have a closer look one of the three parts of the original Z408 cipher: He says that inspecting the back of the paper reveals Zodiac used…

2017 Symposium on Cryptologic History

Good news: My presentation proposal for this year’s crypto symposium was accepted! Title: The Unsolved Zodiac 340 Cipher: Features or Phantoms? Abstract: The Zodiac Killer’s first cipher was a simple substitution cipher that was quickly solved by amateur codebreakers. But…

Ciphers that resemble Zodiac’s 340-character cryptogram

I believe the best way to keep attacking the Zodiac’s 340-character cipher is to create more test ciphers that share many of its features. If we can easily crack test ciphers under many different schemes, and the Zodiac 340 still…

The Zodiac Ciphers – What do we know, and when do we stop trying to solve them?

Here is a video of my talk from the 2015 Cryptologic History Symposium held at the Johns Hopkins University Applied Physics Lab: I had limited time for the talk, so I recorded a new bonus section at the end to…

Crypto Symposium slides

Conference goers, thanks for attending my talk. Here are the slides: https://drive.google.com/file/d/0Bx2ZxPLdifaodG42enNZNmRCRXM/view?usp=sharing (slideshare link) I will work to post a video of the talk soon. So far the conference is filled with many interesting topics. Here’s the agenda if anyone’s…

Zodiac Pattern Drawer

UPDATE, Feb 7, 2016: The Zodiac Pattern Drawer site at sbabaker.com went down, so I attempted to mirror the tool here: http://zodiackillerciphers.com/zodiac-pattern-drawer/ Computer science professor Ryan Garlick at the University of North Texas has been enlisting his students to try…

Speaking at the 2015 Cryptologic History Symposium

The Cryptologic History Symposium sponsored by the NSA’s Center for Cryptologic History is coming up this fall, and they have accepted a paper proposal I recently submitted. The symposium will be on October 22nd and 23rd this year in Laurel,…

Did a chess grandmaster solve the 340?

The World Chess Federation in Las Vegas, NV is involved in a dispute over trademark infringement. The web site for the World Chess Federation has a profile of its founder Stan Vaughan which includes this claim: Grand Master Stan’s expertise…