From: Javier 12 <jvalencia@...>
Date: 2010-12-29T21:00:37+09:00
Subject: Encrypting a File by intercepting its methods

Hi, I've been trying to encrypt file by intercepting File methods, or in
this case, Tempfile methods.

The problem is I need an algorithm that can be used transparently on
each byte, since I don't know how long will be the buffer used by the
user in each read.

For example, ROT13 (very weak) allows concatenation of crypted text like
this:

ABCDEF + XYZ = ABCDEFXYZ

this is the desired behaviour, so I can read buffers of any size and
still be able to decrypt them.

I've tried RC4 with no success.

I want to transparently encrypt reads and writes to disk, is it
possible?

thanks in advance

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