# 50 75 54 54 59 2D 55 73 65 72 2D 4B 65 79 2D 46 69 6C 65 2D 33 3A — File format magic numbers

For 50 75 54 54 59 2D 55 73 65 72 2D 4B 65 79 2D 46 69 6C 65 2D 33 3A, offset is 0; extension is ppk; format is <https://en.wikipedia.org/wiki/PuTTY> PuTTY private key file version 3, recorded from its source on 2026-08-03.

- **Hex signature:** 50 75 54 54 59 2D 55 73 65 72 2D 4B 65 79 2D 46 69 6C 65 2D 33 3A _(unconfirmed — we could not tie this to the quote below)_
- **Offset:** 0
- **Extension:** ppk
- **Format:** <https://en.wikipedia.org/wiki/PuTTY> PuTTY private key file version 3

## What the source says

> PuTTY-User-Key-File-3: | 0 | ppk | <https://en.wikipedia.org/wiki/PuTTY> PuTTY private key file version 3

## Source

- https://en.wikipedia.org/wiki/List_of_file_signatures

Last verified: 2026-08-03. Review by: 2027-08-03.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).