[code_duck]

“I think steganography is an excellent way to deliver encrypted messaging to consumers.” is in your prior post.

If you are not using stegonagraphy for the obscurity aspect, why use it at all? Why not just encrypted plaintext that can be decrypted?

Stegonagraphy is intended to conceal that a message is being sent at all, other than the apparent message of an image. If my recipient and I are both using Cool Stegonagraphy Messaging App, or you are marketing CSMA to the general public, that removes that crucial feature.

As far as storage capacity, I mean is not a concept that stegonagraphy envelops. The amount of data you could include would be limited by the lower level transmission systems - whatever software and hardware you are using to actually transmit, device, store and view images such as image format and your phone storage.

[nobody271]

I meant messaging in a more general context. It does not remove that feature at all. Why do you think that two people using the same app or algorithm automatically reveals the presence of a hidden byte array? You just vary the way data is read out of the image using the same password used for encryption. Even if they could recover every single bit using statistics (which they can't) they would have no idea what order to put them in. That's just one way of doing it too. If you put a real math wizard on the case I'm sure they could do even better.

Storage capacity IS a function of the algorithm and the image. That's simply a fact. For example, say we are just bit flipping a 512x512px image and we take up all 8 bits in each color channel in each pixel. That lets us write 512 * 512 * 8 * 3 = 6291456 bits or about 6Mb. ...I can see how it looks like I was talking about real time communication because I said messaging. That was a mistake and honestly I have been playing around with the thought of if/how steganography could be used for chat but that really was not how I meant it to sound. I was thinking about how steganography might be able to make encryption more user friendly.

[code_duck]

I’m not saying that the message isn’t secure in an encryption sense. It’s just that embedding it in an image has no advantage in an encryption sense, and if the advantage is not secrecy about the presence of a message at all, what is it?

Sure, stegonagraphy has a capacity for information that based on the image format utilized. But the real upper capacity is dependent upon the other layers.

The way to make it user friendly is to make it transparent. I don’t see how this would do that.

[nobody271]

Speaking of layers that's how I want to answer the first part. Encryption makes it secure but steganography makes it portable. Steganography is the sugar that makes the medicine go down. That's how I think it could work anyways, I'm not saying that is what would happen.

[stevenicr]

Certainly for most things I would prefer whatever encryption in transit and whatever data is received is destroyed after viewing. Some people think snapchat is like that, and it's a big reason that many people use it like they do.

However I can imagine some use cases where others would want to keep say a kinky fantasy story someone wrote to them, but need to keep it in a form that if discovered may be difficult to discern that it was a naughty message at all.

Like the "calculator app" that many of the younger folks are using to hide nudes... you'd have a "cool cat memes with friends app" - with some of the images shared having extra data embedded...

some parents and others are getting smarter about seeing the most used apps on a phone, so they are able to question why someone used "hidden locker calculator" 8 hours each day. If you had "cat meme share" being used 8 hours a day, you could open said app and show your parents/lover/ whoever the funny memes.. and they may not know that extra info could be embedded for example.

This may save some people doing bad things, but may also save some people from being outted about their <insert small niche not socially well accepted interest / lover / friend here>