I have an install of zerobin which I use for keys, items that I would prefer not to email but it does not support files, just text. Essentially it's a pastebin.

"TL;DR: ZeroBin is a minimalist, opensource online pastebin/discussion board where the server has zero knowledge of hosted data. Data is encrypted/decrypted in the browser using 256 bits AES."

http://sebsauvage.net/wiki/doku.php?id=php:zerobin

test at http://sebsauvage.net/paste/