gpg4usb is an easy to use, small portable editor with the possibility to encrypt and decrypt any text-message or -file you want. For encryption it acts as a GnuPG -frontend. Its intend is to be used from an usb-stick, running on Windows(TM) and Linux. Providing a mac-binary is on our TODO-list. Our aim is, to give anyone the possibility to send and receive secure encrypted messages anywhere - on any computer out there, no matter if Microsoft Windows(TM) or Linux is running on it. Therefore it's usage should be self-describing, and the user-interface is kept as simple as possible. Of course gpg4usb is open source, as are included libs and binaries.