WhisperKey uses public-key cryptography to encrypt and decrypt messages without the unencrypted content or security keys ever leaving your machine.
It is important to understand that while WhisperKey may be useful to you, it makes no guarantee of security, and you should always thoroughly evaluate any tool or service before trusting it with your sensitive information.
We made this because we wanted a service that we would trust with our own passwords and sensitive messages, and sending them via email makes us nervous.
We’ve made this project open source so you can examine how it works and feel confident in using it. For the daring or truly paranoid, you could even host it yourself.