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0 sats \ 5 replies \ @Scroogey 8h \ parent \ on: Stacker Saloon

The most canonical version of this image that I know of is the one from your GitHub repository in https://github.com/Darth-Coin/darth-coin.github.io/blob/main/assets/images/

But it's a .jpg

$ mediainfo cats-stego.jpg 
General
Complete name                            : cats-stego.jpg
Format                                   : JPEG
File size                                : 38.4 KiB

Image
Format                                   : JPEG
Width                                    : 640 pixels
Height                                   : 480 pixels
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Compression mode                         : Lossy
Stream size                              : 38.4 KiB (100%)

Does that even still contain the steganographic data?

Is there a method to convert a TIFF (written by OpenStego) to a JPG so it retains the information?

Or would I have to put the TIFF itself on the web?

You allude to this in your guide

I can send this photo to anyone (it is necessary without digital alterations/ compression) anywhere in the world, without anyone knowing that this photo contains 1BTC. Or I can even have it as a desktop background or in a digital photo frame-box.

Is the cat image in your guide still containing the secret data, or is this just an illustration of the concept? If it still contains the secret data, how does one create such a JPG file?

308 sats \ 1 reply \ @DarthCoin 4h

check also these tools you can play with:

0 sats \ 0 replies \ @BlokchainB 2h

Thanks I’ll add them to the list of bot busters!

10 sats \ 2 replies \ @DarthCoin 8h

What you inspect is a copy. When you copy the file with stego info is losing the embedded data from stego. Only the original file contain it. By saying that "I can send this image to somebody else" I mean I will use the ORIGINAL file that I used in stego, not a copy. So people looking to "decrypt" this file posted online, will find nothing in fact.

0 sats \ 1 reply \ @Scroogey 8h

Ah, I understand.

When I want to put such an image of my own somewhere public, it's a little suspicious if I post a large .tif file. People might immediately suspect it contains stego.

I was wondering if you had found an elegant way of losslessly compressing it to .jpg.

Best I could think of is ImageMagick's convert image.tif image.jp2 (where JPEG 2000 can contain losslessly compressed data), then rename to image.jpg.

10 sats \ 0 replies \ @DarthCoin 7h

keep in mind: whatever alteration to the original stego-ed file it will lose all the stego information. Be careful with that, otherwise you could lose the data you put inside. And always test your steganography.

This method is not to be used with only one copy.