From: Demec <demec@...>
Date: 2010-04-30T07:00:10+09:00
Subject: Encrypting files in Ruby

So far the tutorials I've seen are for encrypting text and then
decrypting it back.
So for example you have a
 plaintext = "some text"

you encrypt it and the you decrypt it depending on how you encrypted
it.

What I am looking for is to encrypt a whole file and then store it.
for example I allow my users to upload .doc/.xls files in a Rails app.
I want to encrypt those files so I would not store them like that, and
in case a user wants to download it back the app will decrypt it and
then send it to user.

How can I do this ?