[jackjeff]

> The video stream is encoded as one single JPEG2000 picture per frame. Each frame is encrypted with the same static AES key.

Is this not a problem? It’s not a good idea to reuse the same key to encrypt very similar files. Similar to ECB. See the famous penguin https://words.filippo.io/the-ecb-penguin/

I’m surprised they don’t use something like XTS commonly used for disk encryption. It derives a unique key for each block/frame and allow you to access each individual blocks/frames non sequentially.

[perryflynn]

No. They use a unique IV for each frame:

> Every Frame is using a unique IV (Initialization Vector), which ensures that the AES Block Cipher generates always different cipher texts and makes brute force harder. This works similar to a Password Salt.

[jackjeff]

Oh thanks. I missed that. I guess that works pretty well too!