[sufficient]

On Android, we provide the OpenPGP implementation OpenKeychain that now also supports an impressive list of Security Tokens (https://github.com/open-keychain/open-keychain/wiki/Security...). In our newest release, we also support YubiKey 4 over USB-C, which is a great alternative to NFC (which is only support by YubiKey NEO).

Regarding SSH: We submitted a pull request to ConnectBot. You can try it out if you like: https://github.com/connectbot/connectbot/pull/567

[bergie]

Out of curiosity, can software running in Termux (SSH, gpg, etc) talk to the yubikey?

[jopsen]

fantastic, I use password-store on Android, and this would hopefully remove the need for a dedicated pull/push key..