Re: xorpng

On 1/5/2025 2:18 PM, Stefan Claas wrote:

Chris M. Thomasson wrote:

On 1/5/2025 2:06 PM, Chris M. Thomasson wrote:

On 1/5/2025 1:25 AM, 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.
>

>
Well, posting a png to say, facebook, well... It's probablly going to
turn it into a jpg... This can ruin the embedded ciphertext in the png
image...

>
Actually, the damn FB allows me to send my links with embedded
ciphertext just fine.

 It is for X and not Meta.
 

Well, sending say a PNG to X, it still might convert it into a JPG. It might alter things for compression purposes. This can mess around with your payload...