Well irssinotifier uses Google cloud messaging (is that the current name? The Google push service). It encrypts messages on the server and decrypts them in the

Well irssinotifier uses Google cloud messaging (is that the current name? The Google push service). It encrypts messages on the server and decrypts them in the client, using a passphrase. It's a technically neat solution but a bit annoying to set up. It has a script for weechat (and of course irssi), not sure about other clients. Or you can use pushbullet /..., there should be scripts for any popular scriptable client