QUESTIONS WORTH KEEPING OPEN

Open No. Many solutions have been announced, but none yields a consistent translation accepted by independent specialists. The vellum of Beinecke MS 408 is radiocarbon-dated to 1404–1438. Read the file.

A question is unsolved when surviving evidence exists but does not yet support a single tested answer. That differs from a claim that has been tested and disproven, such as ancient crystal skulls. See Our Standards.

It was a geared analogue calculator modelling cycles such as the 223-month Saros eclipse cycle. It was not programmable, and it fits within recorded Hellenistic astronomy. Read the file.

Linear B sound values can be applied to Linear A, but the resulting words match no known language, and the corpus of roughly 1,400 short inscriptions is small. Read the file.

Unsupported The only ancient source is Plato, around 360 BCE. No archaeological evidence exists. Read the file.

Open John White found "CROATOAN" carved on a post in 1590. Relocation and assimilation is the leading hypothesis, but no find has confirmed it. Read the file.

Marian Rejewski of the Polish Cipher Bureau reconstructed the rotor wiring by the end of 1932. The Poles shared their methods with Britain and France in July 1939. Read the file.

No. Every reconstruction on this site is labelled as an illustration. It helps orientation; it is not archival evidence.

Yes. The Z340 team in 2020 included independent enthusiasts, and the FBI confirmed their solution. Rigour matters more than credentials. You can send us evidence.