Zodiac Killer’s Cipher: Understanding /zooim46d7u4

The Zodiac Killer, an unidentified American serial killer, terrorized the San Francisco Bay Area in the 1960s and 1970s. Among his notorious acts was the creation of encrypted messages, one of which is the /zooim46d7u4 cipher. In this article, we will delve deeper into this mysterious cipher, its history, and how it works.

The History of the /zooim46d7u4 Cipher

The Zodiac Killer was known for sending letters to newspapers, taunting the police and bragging about his crimes. The letters often contained cryptograms, or coded messages, that challenged anyone to break them. The first known cryptogram from the Zodiac Killer was sent to the Vallejo Times Herald on July 31, 1969, and it was quickly dubbed the “Z408 cipher” due to its 408 characters.

After the Z408 cipher was solved by a high school teacher and his wife, the Zodiac Killer sent more letters with cryptograms. One of these cryptograms was the Zooim46d7u4 cipher, which was sent in a letter postmarked on November 9, 1969. The cipher consists of 32 characters and has never been definitively solved.

How the /zooim46d7u4 Cipher Works

The Zooim46d7u4 cipher is a substitution cipher, meaning that each letter of the alphabet is replaced with another letter or symbol. Unlike the Z408 cipher, which used a simple substitution method, the Zooim46d7u4 cipher is more complex. The cipher uses a table with two rows of letters and four rows of numbers, with some of the numbers replaced by symbols.

To encrypt a message using the /zooim46d7u4 cipher, the sender would first write out the message in plain text. Then, they would find the corresponding letter or symbol in the table and write it down. For example, the letter “A” would be replaced with the symbol “^”, the letter “B” would be replaced with the letter “H”, and so on.

To decrypt a message using the /zooim46d7u4 cipher, one would have to reverse the process. The receiver would look at each symbol or letter in the encrypted message and find its counterpart in the table. Then, they would write down the corresponding letter in plain text.

The Cipher’s Significance

The Zooim46d7u4 cipher has remained unsolved for over 50 years, despite numerous attempts by amateur and professional cryptographers. Some experts believe that the cipher may not actually contain a message, but is instead a decoy designed to frustrate and confuse codebreakers.

Regardless of its contents, the /zooim46d7u4 cipher has captured the attention of true crime enthusiasts and cryptographers alike. Its complexity and the mystery surrounding its purpose continue to fascinate people to this day.

Also read this post: Do you know about Colestein Veglin?


The /zooim46d7u4 cipher is a complex substitution cipher created by the notorious Zodiac Killer. Its history and complexity have made it a subject of fascination for codebreakers and true crime enthusiasts for over 50 years. Despite numerous attempts to solve it, the cipher remains unsolved, adding to the enigma of the Zodiac Killer and his crimes.

More informative blogs visit to wikipedia.

Zeen is a next generation WordPress theme. It’s powerful, beautifully designed and comes with everything you need to engage your visitors and increase conversions.