# Shannon 1949: Communication Theory of Secrecy Systems

> Claude E. Shannon, 1949. 1 records on Mysteries Department cite it. The book uses Shannon's unicity distance to estimate how much ciphertext is needed…

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[Sources](https://mysteriesdept.com/sources)[Voynich Manuscript](https://mysteriesdept.com/mysteries/voynich-manuscript)Shannon 1949

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# Communication Theory of Secrecy Systems

Claude E. Shannon, 1949. _Bell System Technical Journal_ 28(4): 656–715.

Shannon's mathematical theory of secrecy systems, which treats cryptography as a problem in communication theory and introduces ideas such as unicity distance.

**Voynich Manuscript** Articledoi: **[10.1002/j.1538-7305.1949.tb00928.x](https://doi.org/10.1002/j.1538-7305.1949.tb00928.x)** Checked against the original0

## What it's used for here

The book uses Shannon's unicity distance to estimate how much ciphertext is needed before only one key yields plausible Latin.

## Cited by on this site 1 record

[Reading Without a Key](https://mysteriesdept.com/sources/SRC0D8NJAWT22V4/reading-without-a-key)

The book, version 2.0

SRC

## Cite it

```
Shannon, C. E. (1949). Communication Theory of Secrecy Systems. Bell System Technical Journal, 28(4), 656–715. https://doi.org/10.1002/j.1538-7305.1949.tb00928.x
```

[Find it at doi.org](https://doi.org/10.1002/j.1538-7305.1949.tb00928.x)

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