encipher.it[1] actually looks like it'll fit the bill. It's a browser tool that works from a bookmark, but does all the encryption clientside with JS (I've done

encipher.it[1] actually looks like it'll fit the bill. It's a browser tool that works from a bookmark, but does all the encryption clientside with JS (I've done a quick glance through the code to verify this) You and your accountant just need a shared password. For the other attachments, a protected zip/rar file should be sufficient. [1] https://encipher.it/ https://encipher.it/