> You can use something called Openkeychain on Android. It uses NFC Yubikeys for both PGP and SSH. Okay, but open-keychain does not provide GUI to just sign or

> You can use something called Openkeychain on Android. It uses NFC Yubikeys for both PGP and SSH. Okay, but open-keychain does not provide GUI to just sign or authenticate a user (you can sign as part of encryption process) so I was wondering if the parent was mentioning some application that interfaces with open Keychain (like k9mail or conversations.im) that gives just that: user authentication.