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Substitution Cipher Modeled on the Voynich Manuscript

🧩 Bruce Schneier highlights a new paper proposing the Naibbe cipher, a verbose homophonic substitution method that transforms Latin and Italian plaintext into ciphertext resembling the Voynich Manuscript. The author demonstrates the cipher can be executed entirely by hand with plausible 15th‑century materials. Applied to a range of texts, Naibbe reproduces many of the manuscript’s key statistical properties while remaining decipherable. Schneier observes this keeps the ciphertext hypothesis viable and places constraints on plausible substitution structures.