[ale] encryption/obfuscation (Was: No, wait- Leonard ...)

[Brian]

It might also be worth noting that there was a proof
of concept virus (W32:Perrun virus) that was believed
to have originated from the Philippines that hides in
a jpeg file. Is this considered steganography?

--- Kevin Krumwiede <krum at smyrnacable.net> wrote:
> On Tue, 2002-07-09 at 15:09, Sean Kilpatrick wrote:
>  

> 
> That's right, though I don't know if it's been done
> with JPEG files.  I
> know it can be done with lossless image formats and
> even sound or video
> files.  And you can encode not just text, but any
> type of data.
> 
> The concept is simple.  The least significant bit of
> each pixel is
> replaced with a bit from the data to be encoded.  If
> the LSBs were
> fairly random to begin with, as in a photograph, the
> image will not be
> visibly altered.  If the data is plaintext or some
> well-known file
> format, in theory it would be easily identified. 
> But if the data were
> encrypted it might be impossible to detect.
> 
> Krum
> 
> 
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