A French amateur codebreaker claims to have done what police and other investigators could not: Solve the remaining Zodiac Killer ciphers, including one that supposedly reveals the California killer’s identity – but the internet has rejected his proposed solutions.

Fayçal Ziraoui, 38, a French-Morrocan business consultant said he spent two weeks on the puzzles, after which he believed he had solved them. He shared his findings with the Reddit sub-thread devoted to the quest of solving the ciphers, according to reports. 

Moderators of the 50,000-member subreddit removed the post in question because it was "too short" and the puzzle "is not solvable at all without more information from the author.

https://www.egypttales.com/2021/06/report-zodiac-killer-french-engineer.html