The first of the three cipers to be solved, known as the "340 Cipher," was cracked in December 2020 by a mathematician from Australia named Sam Blake, a code breaker/YouTuber from Virginia named David Oranchak, and a computer programmer from Belgium named Jarl Van Eycke. It reads:
"I HOPE YOU ARE HAVING LOTS OF FUN IN TRYING TO CATCH METHAT WASN'T ME ON THE TV SHOW
WHICH BRINGS UP A POINT ABOUT ME
I AM NOT AFRAID OF THE GAS CHAMBER
BECAUSE IT WILL SEND ME TO PARADICE ALL THE SOONER
BECAUSE I NOW HAVE ENOUGH SLAVES TO WORK FOR ME
WHERE EVERYONE ELSE HAS NOTHING WHEN THEY REACH PARADICE
SO THEY ARE AFRAID OF DEATH
I AM NOT AFRAID BECAUSE I KNOW THAT MY NEW LIFE IS
LIFE WILL BE AN EASY ONE IN PARADICE DEATH"
The Z32 Cipher and the Z13 Cipher (the latter of the two begins with the words, “My Name is __”) are the only two that haven't been officially solved. In fact, some consider these ciphers unsolvable because they're very short and therefore lack the available context needed to determine an encryption key — but Fayçal Ziraoui claims to have done it.
These solutions haven't been officially confirmed, so take what they say with a grain of salt.
Z32 allegedly reads, "LABOR DAY FIND 45.069 NORTH 58.719 WEST" — these are the magnetic coordinates of a location in South Lake Tahoe, a city that the Zodiac Killer has referenced in other letters.
And Z13 is the big one. If solved, this cipher could end a more than 50-year mystery that has consumed the minds of law enforcement, amateur investigators, and even casual true crime fans. According to Ziraoui, that message reads, "My Name is KAYE" (It actually read, "My name is KAYR," which is believed to be a typo).
If true, this would be a massive revelation. One of the primary suspects was a man named Lawrence Kaye, who just so happened to live in South Lake Tahoe. In fact, Detective Harvey Hines, who worked the case, was totally convinced without a shadow of a doubt that Kaye was the Zodiac Killer, but he never had enough evidence to make an arrest. Lawrence Kaye died in 2010.
The validity of Ziraoui's solutions are still up for debate — some people close to the case have outright rejected them, while others (including some professional cryptologists) believe they should be seriously considered.