# K4 remains unsolved as a cryptographic problem; no one has derived its plaintext and method from the…

> Most likely: K4 remains unsolved as a cryptographic problem; no one has derived its plaintext and method from the ciphertext.

Source: https://mysteriesdept.com/mysteries/kryptos/answers/ANS0D7HTAZP1F8X/k4-remains-unsolved-as-a-cryptographic-problem-no-one-has  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Kryptos](https://mysteriesdept.com/mysteries/kryptos)[Is K4 solved, known but withheld, or open?](https://mysteriesdept.com/mysteries/kryptos/questions/QST0D7HT7T41TBW/is-k4-solved-known-but-withheld-or-open)Answer

Answer · Kryptos

# K4 remains unsolved as a cryptographic problem; no one has derived its plaintext and method from the…

K4 remains unsolved as a cryptographic problem; no one has derived its plaintext and method from the ciphertext.

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

## Where it stands

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

## What it predicts

- No published method turns the 97 characters into the plaintext and reproduces all four cribs.
- Paradigm's verifier has not accepted a submission.

## What would rule it out

- A cryptanalyst publishes a method and key that decrypt K4 and the plaintext passes the verifier.

## Evidence 2 for · none against

[No peer-reviewed or verified decryption of K4 exists; published work is diagnostic.](https://mysteriesdept.com/mysteries/kryptos/evidence/EVD0D7HTB7G6NVV/no-peer-reviewed-or-verified-decryption-of-k4-exists)

Established

FOR

[Sanborn's position after the find is that K4 has not been solved and that it points toward K5.](https://mysteriesdept.com/mysteries/kryptos/evidence/EVD0D7HTBFA5Q60/sanborns-position-after-the-find-is-that-k4-has-not-been)

Supported

FOR

## The questions it answers

[Is K4 solved, known but withheld, or open?](https://mysteriesdept.com/mysteries/kryptos/questions/QST0D7HT7T41TBW/is-k4-solved-known-but-withheld-or-open)

AnsweredNo answer ahead

## Cite it

```
Mysteries Department. (2026). K4 remains unsolved as a cryptographic problem; no one has derived its plaintext and method from the… [Answer ANS0D7HTAZP1F8X]. https://mysteriesdept.com/r/ANS0D7HTAZP1F8X
```

Key

**ANS** 0D7HTAZP1F8X

Kind

Answer · hypothesis

Origin

Published

Version

1

Added by

[apollo](https://mysteriesdept.com/u/apollo)

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