Has Kryptos K4 Been Solved? The CIA Code, the $962,500 Answer, and the People Who Found It First

What is Kryptos K4?

Kryptos is an artwork at CIA headquarters, not a leaked intelligence dispatch. The CIA Museum describes a copper screen supported by petrified wood, with additional stone elements and a pool. Artist James Sanborn used multiple encryption methods. Three sections have been deciphered; the museum still describes the fourth as elusive. That is a useful introduction to the object, but the undated museum page cannot by itself settle what happened after the 2025 archive discovery. [1]

The people who found the answer before the auction

The crucial change came through research in a collection, rather than a demonstrated attack on the ciphertext. In a February 2026 account, Smithsonian Secretary Lonnie G. Bunch III explained that scraps bearing the answer had accidentally entered Sanborn's papers at the Archives of American Art. Two journalists encountered them the preceding September. His account explicitly distinguishes archival discovery from code-breaking. It also says the finders did not plan to publish the answer. [2]

WIRED identifies the researchers as Jarett Kobek and Richard Byrne: Byrne photographed the holdings, and Kobek recognized the plaintext in those photographs. They agreed to withhold it, and the Smithsonian restricted access. This supports credit for finding the text before the sale, not a claim that they derived Sanborn's encryption method. We have not independently inspected those restricted papers. [3]

What did $962,500 actually buy?

RR Auction's own results announcement, dated 21 November 2025, records a $962,500 sale at the auction that closed on 20 November. Its prices include buyer's premium. The figure covers a comprehensive archive, not a payment to a codebreaker for solving K4. The listed contents include handwritten K4 plaintext, its original coding system, other coding charts, a proof-of-concept copper plate and photographic material. The announcement also describes alternate material called K5. [4]

The auction house initially called the purchaser anonymous. It offered a private session with Sanborn as part of the transfer. Those are the seller's documented sale terms; they do not demonstrate that the general public can now reproduce a decryption. Nor does a sale price establish the truth of any proposed plaintext circulating online. [4]

Why the buyer says it has not read the answer

On 12 June 2026, Dan Robinson and Matt Huang announced on Paradigm's own site that the firm had become steward of the archive. They say Sanborn entered his plaintext into a computer that produced a SHA-256 hash and a verification tag through Google Cloud Key Management Service; the computer was then wiped. Their stated aim was to check submissions while keeping the text hidden even from themselves. This is the purchaser's account of its process, not an independent security audit. [5]

Paradigm distinguishes its new puzzle competition from K4 itself. The article says a K4 submission costs $1 and describes a possible later release of K5. Neither a separate challenge nor a verifier proves a public K4 solution. We used no paid submission and do not treat the announcement of a future release as evidence that it has occurred. [5]

What can and cannot be confirmed

Confirmed at the level of the cited records: the sculpture exists, an archival plaintext discovery preceded the sale, the seller reported a $962,500 archive transaction, and Paradigm publicly claimed stewardship. Not established here: the full restricted plaintext, an independently checked public encryption method, or a later successful solver. Missing (缺): a public derivation that can be checked from ciphertext to authenticated plaintext. The UNSOLVED stamp refers to that public cryptanalytic question. It does not imply nobody knows the text.

For related reading, the Cicada 3301 and Voynich manuscript files below examine two other situations in which a plausible-looking answer must be separated from a verifiable solution. They are distinct subjects, not additional Kryptos evidence.