[extropy-chat] Re: codes in scam letters

[Eugen Leitl]

On Wed, Sep 28, 2005 at 07:43:47PM -0400, Harvey Newstrom wrote:

> My example was merely meant to show that this is not always the case.  
> By showing how some predictable graphics programs could thwart a 
> seemingly good steganographic process without the user's knowledge, I 

Last time we looked at a review (several years ago, as you remember)
most steganography tools were pathetic. I don't think this situation
has changed dramatically. Cryptograpy and cypherpunk agenda have
ceased to be cool a while ago.

> was merely trying to show that truly undetectable steganography is 
> harder than it looks.  You can't just grab a good steaganographic 

Of course it does. But blanket screening for steganography on a 
terabit router is also quite difficult. Even if you have the resources
to reassemble the packets on the fly and run statistic tests on them,
what will you do with false positives?

> program and use random images off the Internet and be assured that they 

It would be a very dumb idea to use random images off the Internet,
though it would be quite difficult to find the original, as the hash
won't match anymore. I would just get a good digital camera with
RAW capabilities, or a nice video camera. 

> are undetectable all the time.  This might work most of the time, but 
> to get a high assurance on all messages takes a lot more expertise.  An 
> unskilled person may very well produce detectable messages even with a 
> good steganographic program.

An unskilled person will almost certainly produce an image with
a detectable signature.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a>
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ICBM: 48.07100, 11.36820            http://www.leitl.org
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