Does anyone know of a desktop application that will allow me to type/paste a string, the string is encrypted, I can then copy and paste it somewhere else, e.g., email, IM. The person on the other end, and I, would have a pre-shared password. They can use that password to decrypt the string using the same software.
Ideally this software is for Mac OS X. However, I can possibly work with Linux, scripts, Windows, etc. I'm not likely to use a web app or browser plug-in.