Transmission Security is what it was called IIRC.  In the military crypto
systems I worked on (long long ago), the encrypted data stream was constant,
even during non-message periods, because even the knowledge of message
frequency is sensitive information.  Likewise I would expect an encrypted
video stream to have the sync encrypted as well, indistinguishable from the
frame data.

GC


>
> Only if the encryption keys change periodically (like every frame).
> If the scene is static, what's to prevent me from just capturing the
> ENCODED scene, and replaying the encrypted data, looping at the
> repetition point (vertical sync)?
>
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