On Android, we provide the OpenPGP implementation OpenKeychain that now also supports an impressive list of Security Tokens (https://github.com/open-keychain/op

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-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 https://github.com/connectbot/connectbot/pull/567