PNG and Hidden Pixels

Re:PNG and Hidden Pixels by steganograaf on Tuesday September 01, 2020 @05:01AM (#24339788)

This might be how the term steganography is mostly used these days, but I disagree that it's the definition of steganography.

An early example of steganography is writing on the scalp of a person and concealing it with the regrowth of hair: https://en.wikipedia.org/wiki/Steganography#History . The message is clear-text, you just have to know where to look for it. Which is the same as in the blog post.

Some other non-computer examples: https://www.commonlounge.com/discussion/4bc16dbc2c7145ff87ad...

At the risk of "appeal to authority", my field of study is cryptography, and we used steganography in this broad sense.

tl;dr: I agree with the blog post in that it is steganography.

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Re:PNG and Hidden Pixels by HelloNurse on Tuesday September 01, 2020 @10:01AM (#24341781)

If it includes a marginally hidden container with an obvious structure this sense of "steganography" seems formally correct (secrecy without a secret key) but overly broad in practice.

Consider, for example, that you can apply "normal" steganography to the image data in the overlong PNG content (claiming, for example, that you just "hid" a porn picture at the bottom of a cute kitten while there's a secret message in the whole composite picture).

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Re:PNG and Hidden Pixels by 082349872349872 on Tuesday September 01, 2020 @11:46AM (#24343036)

Applying that scenario to Kabbalah, you may have just come up with an explanation for the canonical status of the Song of Songs.

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