# IMEX failed to complete: rPGP error: no matching packet found

**URL:** <https://support.delta.chat/t/imex-failed-to-complete-rpgp-error-no-matching-packet-found/3042>\
**Category:** Mutual Help\
**Tags:** android\
**Created:** [April 29, 2024, 10:12pm UTC](https://support.delta.chat/t/imex-failed-to-complete-rpgp-error-no-matching-packet-found/3042 "2024-04-29T22:12:42Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![r10s](https://support.delta.chat/user_avatar/support.delta.chat/r10s/32/1513_2.png) [@r10s](https://support.delta.chat/u/r10s)\
**Post date:** [April 30, 2024, 10:05am UTC](https://support.delta.chat/t/imex-failed-to-complete-rpgp-error-no-matching-packet-found/3042/2 "2024-04-30T10:05:46Z")

</div>

in general, Delta Chat is strict in which keys are supported. eg. OpenPGP packets must match [Autocrypt Level 1: Enabling encryption, avoiding annoyances — Autocrypt 1.1.0 documentation](https://autocrypt.org/level1.html#message-structure), cypher should be Ed25519 plus Cv25519, or RSA

iirc (i am not deep in that topic), this format is used by many todays PGP implementations.

supporting arbitrary, maybe legacy, secret keys is not a primary goal and is always weighted carefully - eg. a larger codebase also means more security risk here. not to speak about implementation and maintenance effort.

some links to - maybe helpful - similar topics:

> [@I am unable to import a key that contains only subkeys.](https://support.delta.chat/t/i-am-unable-to-import-a-key-that-contains-only-subkeys/2986/4):
>
> There is a related issue on GitHub: I closed it as not planned, Delta Chat does not support importing a subkey without primary key.

> [@DeltaChat fails to import keys](https://support.delta.chat/t/deltachat-fails-to-import-keys/2592/5):
>
> Maybe we should export both private and public key to a single file. Selecting a file on Android and similarly sandboxed platforms like Flatpak seems to be much less error-prone than selecting a folder, there are no failures like “granted access to the folder but not the files inside of it” possible. gpg itself does not allow to use both --export and --export-secret-keys though, so having such file with both keys concatenated is probably not common. Maybe it is possible to drop the public key …

> <https://github.com/deltachat/deltachat-core-rust/issues/3499>
>
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