Re: Crosspass - a simple way to share passwords, encryption keys, banking info
It might be nice if you can create a Offline App that can be used to import private keys for paper wallets. Imagine if you can encrypt the private key offline, before you use it and when you go online to import it.. then it quickly decrypt it before you import it.
That's called BIP38 encryption.Quote
(It does not give the hacker the time to capture and use it, before you use it) 
That's a huge gamble! Chances are "the hacker" is just a piece of automated malware, and chances are it's a lot faster than you are. That is of course what you should assume, and take measures to prevent it. So instead of risking everything by decrypting your private key on an online computer, it's much better to sign the transaction offline and never expose your private key to an online machine.Quote
Many people have malware / Clipboard hacks etc... that collect private keys, when you paste it in text ... and if the hacker is fast enough, he or she can exploit that.... but if the private key are encrypted "offline" and then decrypted just before you use it online to import, it will help you to prevent that exploit.
You seem to think hacks happen when someone is manually monitoring your computer.