I also added edit here:
Code:
If A XOR B = C : Then C XOR B = A [EDIT: Also, C XOR A = B]
also note this
Quote:
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(You could also just use any clip that you both have as a key clip, maybe with pre arranged fixed seed AddGrain)
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You could have a shared secret clip, of same size colorspace as you are sending [sent once only, could be something completely innocuous looking like tv adverts].
Make your SHARED_KEY clip same characteristics as TARGET clip (looping and trim to make same length as TARGET).
Randomize your SHARED_KEY by using eg AddGrain (with some SECRET_KEY as seed),
OR mix together somehow with a RandomSource KEY (using you SECRET_KEY seed). [Overlay with Pre_Shared Opacity arg , or whatever you like].
So long as recipient uses same method to construct the final KEY clip, then you are in business.
Added this to earlier post.
EDIT: Of course, you could not compress result of encode (although I'm kinda curious what it might look like if you do).