Compress, and then encrypt can be quite devastating if the attacker can insert data into the encrypted payload. For instance, let's say I can insert any word i

Compress, and then encrypt can be quite devastating if the attacker can insert data into the encrypted payload. For instance, let's say I can insert any word into an encrypted message. Let's say I insert the word "THE". I can compare the size of the two messages one with the inserted "THE", and the one without. If the size instead of increasing by three bytes increases by less than three. I can be certain the word "THE" is in the message or at least some of the characters. I can keep doing this till I can extract useful information out the message. This is just the same thing. Video that is static compresses well, but video with lots of change does not compress as well. So the camera basically let's you insert extra information into the encrypted data stream. Based of the changing size it leaks info. This one is quite simple. It just tells you where the camera is looking, making the scene more dynamic. However, the issue of compression and encryption applies to much more than just drones.