# A long text (75,000 characters), a known cipher type (homophonic substitution) and a natural language that a…

> Most likely: A long text (75,000 characters), a known cipher type (homophonic substitution) and a natural language that a language model could identify…

Source: https://mysteriesdept.com/mysteries/copiale-cipher/answers/ANS0CYVFM347M49/a-long-text-75-000-characters-a-known-cipher-type-homophonic  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Copiale cipher](https://mysteriesdept.com/mysteries/copiale-cipher)[What made the Copiale cipher solvable when similar-looking documents are not?](https://mysteriesdept.com/mysteries/copiale-cipher/questions/QST0CYVFHN04CEA/what-made-the-copiale-cipher-solvable-when-similar-looking)Answer

Answer · Copiale cipher

# A long text (75,000 characters), a known cipher type (homophonic substitution) and a natural language that a…

A long text (75,000 characters), a known cipher type (homophonic substitution) and a natural language that a language model could identify made statistical decipherment possible.

**Most likely** Answers **1** questionPublished0

## Where it stands

**Most likely** Its tests supported it: two pieces of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- The same method succeeds on other long homophonic ciphers in known languages.
- It fails on short texts, on codes that substitute for words, and on texts in no known language.

## What would rule it out

- The method succeeds on a short text or a word-code, or fails on a comparable long homophonic cipher.

## Evidence 2 for · none against

[Language identification by expectation-maximisation across eighty languages found German; the solution…](https://mysteriesdept.com/mysteries/copiale-cipher/evidence/EVD0CYVFMAY1N6P/language-identification-by-expectation-maximisation-across)

Established

FOR

[The text's length and its ordinary German prose gave the statistics enough to work on.](https://mysteriesdept.com/mysteries/copiale-cipher/evidence/EVD0CYVFMJR566K/the-texts-length-and-its-ordinary-german-prose-gave-the)

Supported

FOR

## The questions it answers

[What made the Copiale cipher solvable when similar-looking documents are not?](https://mysteriesdept.com/mysteries/copiale-cipher/questions/QST0CYVFHN04CEA/what-made-the-copiale-cipher-solvable-when-similar-looking)

AnsweredNo answer ahead

## Cite it

```
Mysteries Department. (2026). A long text (75,000 characters), a known cipher type (homophonic substitution) and a natural language that a… [Answer ANS0CYVFM347M49]. https://mysteriesdept.com/r/ANS0CYVFM347M49
```

Key

**ANS** 0CYVFM347M49

Kind

Answer · hypothesis

Origin

Published

Version

1

Added by

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The record

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