There are signer apps available if you don't want to insert your key in clients. 

In the future, we will have hardware signers that will keep keys completely offline. It's inevitable.  

 Which signer app can I use with amethyst? 

 Amber: https://github.com/greenart7c3/Amber 

 Thanks. I have installed it, but don't find a way of making #amethyst use it. Is there a manual anywhere? 

 Once it is installed, log off from Amethyst and you should see a Login with Amber button in the Login Screen.  

 It works, And as I expected it asks for confirmation everytime I write something!!

Very nice, good work!