The Voynich Manuscript

The Voynich Manuscript is the ultimate unsolved cipher text, having resisted decipherment for over 600 years despite repeated attempts by elite cryptanalysts. This 240-page book, carbon-dated to the early 15th century, is written in an unknown script and features illustrations of unidentifiable plants, astronomical diagrams, and naked women in bathing pools. The script exhibits consistent statistical properties that suggest a real language, not random gibberish, yet no one—including NSA cryptanalysts, AI language models, and academic linguists—has cracked it. Compared to the Somerton Man’s code, which remains uncracked after 74 years, the Voynich Manuscript’s resistance is more pronounced, with a 0% success rate among all known attempts. Housed at Yale University’s Beinecke Library, the manuscript has spawned over 100 theories, ranging from a medieval hoax to a lost language. Its duration of mystery—over 600 years—makes it the longest-running unsolved code on this list.