The Voynich manuscript, undeciphered for a century despite the best cryptographers

Introduction: the most mysterious book in the world

A medieval manuscript held at Yale

Among the precious collections of Yale University's Beinecke Library sits one of the most enigmatic documents ever studied by historians and cryptographers: the Voynich manuscript, a medieval book written in a completely unknown script, accompanied by botanical, astronomical, and biological illustrations whose exact meaning remains, to this day, a complete mystery to the international scientific community.

The document takes its name from the Polish-born book dealer and collector Wilfrid Voynich, who acquired it in the early twentieth century and made it known to the world, sparking a collective fascination that has lasted more than a century, with no one to date having managed to produce a consensual, scientifically validated translation. In the decades since, the manuscript has passed through the hands of several private collectors before finally finding a permanent home in an academic institution equipped to study and protect it properly.

A dating that confirms its medieval authenticity

Rigorous scientific analyses using carbon-14 dating, carried out on the parchment that makes up the book, have established with remarkable precision that the document does indeed date back to the early fifteenth century, definitively ruling out the once-popular theory of an elaborate hoax created more recently by modern forgers.

This scientific confirmation of the manuscript's medieval authenticity has considerably strengthened researchers' interest in the document, turning what could have been a mere collector's curiosity into a legitimate object of scientific study for historians and linguists worldwide. It also closed off an entire branch of speculation that had, for decades, distracted researchers from the more difficult and more interesting question of what the text might actually mean. There is something dizzying about looking at a six-hundred-year-old text that no one, despite every tool modern science has to offer, has yet managed to crack at its most basic level: what does it actually say?

A script that resembles nothing else

An alphabet completely unknown to linguists

The manuscript's text is written in an entirely unknown writing system, made up of characters that match no alphabet, historical or contemporary, catalogued by linguists, a peculiarity that immediately intrigued the first researchers who seriously attempted to study the document after its rediscovery in the early twentieth century.

This script, nicknamed by some researchers Voynichese, displays statistical and structural characteristics that, according to certain recent computational analyses, suggest the properties of a genuine natural language rather than those of a random text or a hoax deliberately made incomprehensible to fool potential buyers.

Decoding attempts that have all come up empty

Many professional cryptographers and passionate amateurs have tackled this persistent mystery over the decades, proposing theories as varied as they are bold, ranging from a complex cipher based on a known European language to the hypothesis of an artificial language entirely invented by its medieval author for reasons that also remain completely unknown.

None of these attempts, despite their methodological diversity and the growing sophistication of the analytical tools used over time, has so far won the consensus and validation of the international scientific community specializing in ancient languages and historical cryptographic systems. Every few years a new claimed breakthrough makes headlines, only to be quietly dismantled by specialists once the proposed translation is checked against the underlying text.

Even World War II codebreakers were stumped

Seasoned military experts left in check

Remarkably, some of the finest military cryptanalysts who helped crack Nazi codes during the Second World War, including experts trained within American and British intelligence circles, also took a crack at this persistent mystery without managing to produce a single convincing and verifiable translation of the text.

This collective failure by some of the brightest minds of their generation in applied cryptography has considerably reinforced the reputation of the Voynich manuscript as one of the most unsolvable documentary mysteries the international scientific community has ever encountered. If wartime codebreakers accustomed to cracking state secrets under pressure could not make headway, the argument goes, then the manuscript's resistance can hardly be dismissed as a lack of effort or expertise.

The digital age has yet to crack the mystery

More recently, the arrival of powerful computing tools and artificial intelligence algorithms specialized in statistical linguistic analysis has periodically revived hopes of a definitive decoding, with several research teams publishing in-depth computational analyses of the text over the past decade.

Despite these undeniable technological advances, none of these recent digital analyses has managed to produce a fully convincing translation accepted by the entire scientific community, with the manuscript continuing to resist, with remarkable consistency, every decoding attempt made so far. It's a little dizzying to measure, here, the limits of our most sophisticated tools against a text that seems to have been specifically designed, six centuries ago, to resist any outside attempt at understanding it.

Illustrations as puzzling as the text itself

Botanical plants nowhere to be found in nature

The manuscript includes numerous detailed illustrations of botanical plants, but its most troubling feature lies in the fact that none of the plant species depicted correspond precisely to real plants actually identified and catalogued in the known flora recognized by contemporary botanists.

This feature has led some researchers to suggest that these illustrations might represent imaginary composite plants, assembled from several distinct species, or deliberately stylized and distorted depictions of real plants for still-unknown purposes, perhaps medicinal or symbolic.

Puzzling astronomical and biological diagrams

Beyond the botanical illustrations, the manuscript also contains complex astronomical diagrams as well as particularly unusual biological depictions, including scenes featuring numerous nude female figures immersed in structures resembling pipes or basins connected in a labyrinthine fashion.

These biological illustrations, among the most discussed in the entire manuscript, have prompted widely varying interpretations from researchers, some seeing references to medieval medicinal or bathing practices, others alchemical or astrological symbols whose exact meaning remains, like the rest of the text, completely undeciphered.

The main theories on the manuscript's origin

A lost medicinal or alchemical treatise

One of the most widely discussed theories suggests that the manuscript could be a treatise on medieval medicine or alchemy, written in a coded language to protect knowledge its author considered precious or dangerous, a practice that was fairly common among certain scholars and practitioners of the late medieval period.

This hypothesis rests notably on the abundant presence of botanical illustrations and diagrams evoking pharmaceutical preparations or alchemical rituals, although the absence of any confirmed translation obviously prevents definitively validating this interpretation among the many others proposed over the decades.

An elaborate hoax or an invented artificial language

Other researchers instead favor the hypothesis of an elaborate hoax, designed from the outset to be sold at a high price to a credulous collector, a practice that already existed in medieval times, although this theory struggles to fully explain the remarkable statistical and structural consistency observed in the text by computational linguists.

An alternative hypothesis, equally debated, proposes that the text could represent a genuine constructed language, deliberately invented by its author for personal or religious reasons that remain unknown, a practice that, while rare, was not entirely absent from certain learned circles in the medieval and Renaissance periods.

A scientific showcase for a one-of-a-kind document

Since its acquisition by Yale University, the manuscript has been carefully preserved within the Beinecke Library, which specializes in preserving rare books and ancient manuscripts, where strictly controlled preservation conditions guarantee the optimal conservation of this exceptional document for future generations of researchers.

The institution has also taken the initiative of digitizing the entire manuscript and making these images freely accessible to the public online, an act of scientific openness that has considerably eased research carried out by independent teams of researchers around the world for several years now. This decision effectively removed the last practical barrier to studying the manuscript, allowing anyone with an internet connection to examine its pages in the same detail once reserved for a handful of specialists granted physical access.

A worldwide community of passionate researchers

This digital accessibility has allowed a genuine international community of researchers, informed amateurs, and enthusiasts of historical mysteries to emerge, actively collaborating online to share their analyses, theories, and potential discoveries about a text that continues to fascinate specialists and curious members of the public alike.

This collaborative dynamic, greatly facilitated by contemporary digital tools, perfectly illustrates how a centuries-old mystery can continue to mobilize the attention and collective ingenuity of a worldwide community determined to one day crack this particularly stubborn secret. There is a touching kind of beauty in this collective persistence, this stubborn refusal to give up on a mystery that has nonetheless resisted the greatest cryptographic minds for more than a century.

Why does this mystery continue to fascinate so much?

The universal pull of the unknown and unresolved

The Voynich manuscript's lasting fascination stems partly from the universal pull that unsolved mysteries hold over the collective imagination, with this document offering a particularly rich intellectual playground for anyone interested in the most complex historical, linguistic, or cryptographic puzzles.

This fascination extends well beyond specialized academic circles, also touching a much broader audience of curious minds and history enthusiasts, regularly exposed to this mystery through television documentaries, popular science articles, or works of fiction directly inspired by this enigmatic document.

A symbol of the limits of human knowledge

Beyond its purely recreational appeal, the Voynich manuscript also represents, for many researchers, a powerful symbol of the lasting limits of human knowledge, a humbling reminder that certain secrets of the past can continue to resist indefinitely even the most sophisticated tools of contemporary science.

This philosophical dimension of the mystery, often highlighted by the most experienced researchers in the field, largely explains why this document continues, more than a century after its rediscovery, to captivate the attention of the international scientific community as much as that of the general public fascinated by historical enigmas.

Conclusion: a mystery that may never be fully solved

A puzzle that spans generations

More than a century after its rediscovery by Wilfrid Voynich, this medieval manuscript continues to defy every advanced scientific, linguistic, and computational tool made available by contemporary research, remaining to this day one of the most mysterious documents ever studied by humankind.

This remarkable resistance to decades of combined effort by military cryptographers, university linguists, and computer scientists specializing in artificial intelligence testifies to the exceptional complexity of this text, whose secret, according to some pessimistic researchers, may never be definitively cracked.

A standing invitation to scientific curiosity

Whatever the future outcome of this research, the Voynich manuscript will no doubt continue to embody, for generations of researchers to come, one of the most fascinating examples of the past's ability to guard its most intimate secrets, despite all the technical progress achieved by humanity since its creation.

This exceptional document thus remains a standing invitation to scientific curiosity and intellectual humility, a reminder that certain historical mysteries deserve to be approached with patience, rigor, and a healthy dose of lasting fascination for the unknown that still lingers, at times, at the heart of our hyperconnected world.

By Maxime Marquette, columnist

Sources

Primary sources

Beinecke Library, Yale University — official presentation of the Voynich manuscript — accessed in 2026

Yale University Library — resources on ancient manuscripts — accessed in 2026

Encyclopaedia Britannica — history and analysis of the Voynich manuscript — accessed in 2026

Secondary sources

Smithsonian Magazine History — the mysteries of the Voynich manuscript — accessed in 2026

BBC Future — attempts to decode the Voynich manuscript — accessed in 2026

National Geographic History — unsolved historical enigmas — accessed in 2026