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From: Stefan Claas <pollux@tilde.club>
Newsgroups: sci.crypt
Subject: Re: xorpng
Date: Sun, 5 Jan 2025 10:24:02 +0100
Organization: To protect and to server
Message-ID: <vldj3j$pqvr$1@paganini.bofh.team>
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Chris M. Thomasson wrote:
> On 1/4/2025 4:21 PM, Stefan Claas wrote:
> > Rich wrote:
> > 
> > > If instead you mean some kind of "special, PNG aware, encryptor that
> > > only encrypted the bitmap data of a PNG", but left the file as
> > > otherwise a proper PNG image structure, then that is slightly tricky
> > > (and an algorithm that is only useful for PNG's alone).
> > 
> > Yes, this is what I mean.
> > 
> 
> Well, take a good ol' bag o' bytes and turn it into a valid png?

No, encrypt a .png, so that an encrypted noise image comes out.

-- 
Regards
Stefan