Comment by the_hoffa

I mean, steganography has been a thing for quite a while. Not disagreeing, just saying this is how some programs/ideas were passed around the internet decades ago by "less than upstanding netizens" ;)

Wanted to pass a secret code to a friend? Encode the bit-data in the alpha channel of an image. It could even be encrypted/scrambled within the image itself. Post the perfectly normal image to a public forum, ping your friend, they run it through the "decoder" and Robert's your mother's brother.

Of course these weren't "logic bombs" like this post is describing, but even those have been around for a while too.

Hacking is fun :)