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From: Stefan Claas <pollux@tilde.club>
Newsgroups: sci.crypt
Subject: Re: xorpng
Date: Sun, 5 Jan 2025 10:40:58 +0100
Organization: To protect and to server
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Stefan Claas wrote:
> Rich wrote:
> > Stefan Claas <pollux@tilde.club> 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. 
> > 
> > Which brings up the question of: why?
> > 
> > Why go to the trouble to create an encryptor that is specalized for 
> > just encrypting the internal bitmap data within a PNG, leaving the rest 
> > as a PNG file, when a generic "byte stream" encryptor will encrypt the 
> > entire PNG with no extra effort?
> 
> To make more content as allowed postable on social media, like X.

I.e, first you put data with file2png in a .png and then encrypt it
to finally post it. I can do this now with my xorpic program, but
I thought a solution with AES-GCM or XChaCha20+ploy1305 is better.

-- 
Regards
Stefan