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

Peter Gutmann pgut001 at cs.auckland.ac.nz
Fri Oct 16 21:57:44 PDT 2009


John Case <case at 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.





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