Re: Why aren't known-plaintext attacks against digital media trivial ?

John Case <case@sdf.lonestar.org> writes:

Let's say I am authoring a video clip for blu-ray. I have a scene transition that goes to solid black. Let's further say that the tool I am using allows me to insert such "screens" and I define them with hex color values ... so I simply say "fill screen with #000000 for 2 seconds".

Which essentially turns into a display resulting in 1920x1080 pixels of that hex code. For 30-60 frames per second.

Which after compression turns into a handful of bytes, encoding (initially) "big block of nothing" and then "same as before".

Why aren't events like this huge sources of known-plaintext ?

See above. Peter.