> I doubt they are actually doing it this way as I imagine the overhead would be very high It wouldn't be very high, they could easily put the burden on the cl

> I doubt they are actually doing it this way as I imagine the overhead would be very high It wouldn't be very high, they could easily put the burden on the client to do the encryption and like all practical public key encryption they only thing you encrypt with the public key(s) is a symmetric encryption key that the content is encrypted with.