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From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups: sci.crypt
Subject: Re: xorpng
Date: Sat, 11 Jan 2025 02:47:14 -0800
Organization: A noiseless patient Spider
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On 1/11/2025 2:15 AM, Stefan Claas wrote:
> Stefan Claas wrote:
> 
>> To make things simple again, I uploaded pngcrypt, so that one can use
>> file2png with pngcrypt. :-) https://github.com/706f6c6c7578/pngcrypt
> 
> https://jmp.sh/ENeHGh9r
> 
> $ echo "I wish the sci.crypt community a nice weekend!" | file2png | pngcrypt -p test > message.png
> 
> $ pngcrypt -d -p test < message.png | file2png -d
> I wish the sci.crypt community a nice weekend!
> 

Make a big one, say 3840x2160 encrypting the same byte. See if you can 
visually see any patterns wrt the encryption algo itself?