I've read that encrypted data should be, theoretically, indistinguishable from random data. Using this principle of encryption, could I combine encrypted network traffic streams to generate either a seed for a randomness algorithm or simply combine them for the random number itself?
For example: I could take data from a Tails or other Tor connected device and simply specify which incoming node to listen to and for how long, not only would the attacker have to know I used this system but they'd have to know the index and duration of the nodes I choose.
For context: I only need a few MB of extremely random data at very infrequent intervals. So time and memory efficiency doesn't matter all that much.
To address a comment by DannyNiu: Obviously they now know this system exists but if it can run on any encrypted network then, as opposed to using a random number generator website, you do not know which computer is collecting network traffic for this purpose since any encrypted data could be used.