Stories of the Most Complex Encryptions Ever Created

Encryption has been a cornerstone of secure communication throughout history. From ancient ciphers to complex digital algorithms, encryption has continually evolved, adapting to secure communication needs in various contexts. We’ll explore some of the most complex and significant encryption systems ever created, revealing their intriguing stories and technical aspects.


The Spartans and the Scytale: Ancient Encryption in Action

Moving back to ancient times, the Spartans, known for their military prowess, also contributed significantly to the field of encryption. According to ExpressVPN’s blog piece, In the 7th century, they developed the scytale, a tool that exemplifies early cryptographic ingenuity. The scytale consisted of a wooden rod around which a parchment was wrapped. To send an encrypted message, the Spartans would write along the parchment while it was wrapped around the rod. Once the parchment was unrolled, the writing appeared as a nonsensical jumble of letters. The key to this encryption was the diameter of the rod: the recipient, using a rod of the identical diameter, could wrap the parchment around their scytale to reveal the intended message. While basic compared to modern standards, this method was effective for its time and demonstrates one of the earliest practical uses of encryption in military communications.


The Enigma of World War II

The Enigma machine, a pivotal device in World War II, is a landmark in cryptographic history. Developed by German engineer Arthur Scherbius, the machine encrypted military communications. Its complexity was formidable. The Enigma’s rotor cipher machine created 150 trillion possible settings, thwarting early decryption attempts. Alan Turing and his team at Bletchley Park famously broke the Enigma code, a breakthrough that historians believe shortened the war by two years.


The Hieroglyphs of Ancient Egypt

Long before digital encryption, ancient Egyptians used hieroglyphs to record their language. This system was fully deciphered in the 19th century. The Rosetta Stone, discovered in 1799, was key to understanding these symbols. The decryption of hieroglyphs, more linguistic than cryptographic, nonetheless shares parallels with modern cryptography, particularly in translating unknown symbols to a known language.


The Voynich Manuscript: An Unsolved Mystery

The Voynich Manuscript, a 15th-century book, remains one of the most mysterious undeciphered documents. Despite the efforts of the world’s best cryptanalysts, the book’s language and illustrations baffle experts. This Enigma attracts professional and amateur cryptographers, but its code, consisting of an unknown alphabet and unusual illustrations, has yet to be cracked.


Quantum Encryption: The Future Unveiled

Quantum encryption represents the future of unbreakable codes. Quantum key distribution (QKD) uses quantum mechanics principles, fundamentally changing how information is encrypted and transmitted. Unlike traditional methods, QKD’s security is based on the laws of physics, making it theoretically unbreakable. As quantum computing advances, it could render many current encryption methods obsolete, necessitating a shift to quantum-resistant algorithms.


The Navajo Code Talkers

During World War II, the U.S. Marines recruited Navajo speakers to develop an unbreakable code. Their language, unknown to many and unwritten at the time, was an ideal basis for a secure communication system. The Navajo Code Talkers played a crucial role in securing American communications in the Pacific theater, demonstrating the unique effectiveness of using a native language for encryption.


The Zodiac Killer’s Ciphers

The Zodiac Killer, who terrorized California in the late 1960s and early 1970s, sent encrypted messages to newspapers and police. Only a few of these ciphers have been solved. The 340-character cipher, cracked in 2020 by an international team of private citizens, revealed a taunting message from the killer. The Zodiac case exemplifies how criminal investigations can intersect with complex encryption.


Digital Age: RSA Encryption

RSA encryption, named after its inventors Rivest, Shamir, and Adleman, revolutionized digital security in 1977 (read here). RSA’s security relies on the difficulty of factoring large prime numbers, a problem for which no known efficient solution exists. This encryption method underpins much of today’s internet security, safeguarding online transactions and communications.



The stories of these complex encryptions highlight the perpetual cat-and-mouse game between code makers and codebreakers. From ancient symbols to quantum mechanics, the evolution of encryption demonstrates humanity’s endless pursuit of secure communication. As technology advances, the challenges and significance of encryption will undoubtedly continue to grow, shaping the future of digital security.