Re: xorpng

Chris M. Thomasson wrote:

On 1/5/2025 1:24 AM, Stefan Claas wrote:

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.
 

 
Are you talking about encrypting something A. Taking the resulting
ciphertext B and creating a new png C out of B. The png C will have B a
a visual entity. Now, since C has the ciphertext B in it, we can decrypt
that data back into A.
 
Is this what you are doing?

I am talking about .png image encryption. I got it working for ppm (P6)
files, so that when you have created with Gimp a ppm (raw) file it will
then be encrypted with a password and salt and results in a noise image.

Have you not seen my online folder with the example ... ???

--
Regards
Stefan