Correlations on traffic patterns

Various existing research on this

"Encrypted (Network) Traffic Classification"

• https://www.sciencedirect.com/science/article/pii/S2090447923002502
• https://ieeexplore.ieee.org/document/8622812
• https://www.mdpi.com/2073-8994/13/6/1080

Does not depend on unencrypted SNI!