Kryptos K4: A Reproducible Full Decryption of All 97 Characters
Year: 2025
Type: article
Abstract: K4, the final unsolved section of Kryptos at CIA headquarters, has resisted decryption for more than 30 years. While K1–K3 were solved in the 1990s, K4 remained a global cryptographic mystery, with only a few anchor words (EAST, NORTHEAST, BERLIN, CLOCK) confirmed by sculptor Jim Sanborn. This preprint presents the reproducible full decryption of all 97 ciphertext characters. Using the ψ-passport method, we align confirmed anchors, extract stable reproducible words, and assemble a coherent plaintext line with structural segmentation. The strict reading yields the final seven-letter anomaly AUEKCAR, which under ψ-reading resolves as RACE CAR. The result establishes the fully linearized ψ-passport for K4, combining cryptographic rigor with interpretive closure. This work situates Kryptos not merely as an artistic enigma but as a solved cryptographic artifact whose final passage is now reproducible, transparent, and closed.
Author: Yulia, Logacheva
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7081632502
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