Many will tell you that it's wise to use two-factor authentication to lock down your internet accounts. Actually using it, however, is another story -- there's only so many times you can enter passcodes from your phone before you tear your hair out. LastPass thinks it has a better way. It's launching a LastPass Authenticator app for Android, iOS and Windows Phone that softens the blow when you have many accounts. Instead of entering a passcode to get into LastPass, you can have Authenticator send a simple verify button to sign in with one tap.