# Pgp key format, strength **URL:** \ **Category:** User Testing\ **Created:** [August 15, 2019, 9:44am UTC](https://support.delta.chat/t/pgp-key-format-strength/574 "2019-08-15T09:44:16Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![adrian](https://support.delta.chat/letter_avatar_proxy/v4/letter/a/82dd89/32.png) [@adrian](https://support.delta.chat/u/adrian)\ **Post date:** [August 15, 2019, 9:44am UTC](https://support.delta.chat/t/pgp-key-format-strength/574/1 "2019-08-15T09:44:16Z")
**Delta Chat version** 0.510.1 This is probably a very general question. I didn’t find any information about pgp-key format and strength limitiations. Yesterday I tried to change to strengthen the key and tested several private/public-key combinations: - ``` ecc/ecc Curve 25519/256 ``` - ``` rsa/rsa 4096/4096 ``` - ``` rsa/rsa 4096/3072 ``` - ``` rsa/rsa 3072/3072 ``` The keys were created on the command line by ` gpg --expert --full-generate-key` (no password or username, just an email-address). Afterwards I export private and pulic key seperately, copyied it to /storage/emulated/0/Download and imported the private key with the delta.chat-Android-Client. Experiences: The ecc-format wasn’t excepted at all (no import). I hoped to combine performance and more cipher-strength by switching to ecc. Edit: Just read (linking is not allowed for new users) > A line of heavy activities in the last weeks happend around [RPGP](https://github.com/rpgp/rpgp), the world’s first full-Rust implemenation of OpenPGP from [Friedel Ziegelmayer](https://github.com/dignifiedquire/). His new Rust library supports Autocrypt 1.1 primitives and will allow us to switch from RSA to the shorter and more modern ED25519 keys for e-mail encryption within the next releases. RPGP is working in development builds already. We are working on getting an independent security code review on RPGP. Any of the rsa-keys were successfully imported. I could sent messages to a different mail account and read it with thunderbird/enigmail. However, with none of the rsa-variations I could successfully read messages in the delta.chat-Android-Client. With the default generated key-pair (rsa/rsa 2048/2048) it worked. Are there known limitations? ---
**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:** [February 21, 2026, 11:31am UTC](https://support.delta.chat/t/pgp-key-format-strength/574/2 "2026-02-21T11:31:26Z")