If Anthropic or OpenAI teams ever want a good open-ended challenge: I have an encrypted historical document that resisted all attempts with publicly available frontier models. Definitely verifiable (there is only one cipher or none).
@Dorialexander (posted 2026-05-26) offers an open-ended cryptanalysis challenge…
Brief
Dorialexander proposes a verifiable cryptanalysis challenge (posted 2026-05-26): an encrypted historical document that has withstood all attempts by publicly available frontier models. They invite Anthropic or OpenAI teams to take it on, insisting the text uses either one cipher or no cipher, framing the task as a clear, open-ended test of current models' decryption capabilities.
Why it matters
@Dorialexander (posted 2026-05-26) offers an open-ended cryptanalysis challenge to Anthropic and OpenAI teams involving an encrypted historical document that has resisted all attempts using publicly available frontier models.
Key details
- The author asserts the challenge is verifiable and that the document uses either a single cipher or none, implying a solvable, well-defined ciphertext rather than multiple layered encryptions.