[extropy-chat] Re: codes in scam letters

[Harvey Newstrom]

On Sep 27, 2005, at 10:42 PM, Emlyn wrote:

> So in this case, I != Compress(Uncompress(I)).

Agreed.  This is often the case, and I don't dispute it.

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 
was merely trying to show that truly undetectable steganography is 
harder than it looks.  You can't just grab a good steaganographic 
program and use random images off the Internet and be assured that they 
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.

--
Harvey Newstrom <HarveyNewstrom.com>
CISSP CISA CISM CIFI NSA-IAM GSEC ISSAP ISSMP ISSPCS IBMCP