# Telegram Desktop Encrypted File — file signature 54 44 45 46 at offset 0

For Telegram Desktop Encrypted File, hex signature is 54 44 45 46; offset is 0; extension is TDEF, verified against its source on 2026-09-22.

- **Hex signature:** 54 44 45 46 _(verified: appears in the quote below)_
- **Offset:** 0 _(verified: appears in the quote below)_
- **Extension:** TDEF _(verified: appears in the quote below)_
- **Format:** Telegram Desktop Encrypted File _(verified: appears in the quote below)_

## What the source says

> 54 44 45 46 | TDEF | 0 | TDEF | Telegram Desktop Encrypted File |

## Source

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

Last verified: 2026-09-22. Review by: 2027-09-22.
Part of [File format magic numbers](https://referencesource.org/file-format-signatures/).