>Wouldn't E2E encryption of a call with 40 participants require each user to have 39 times the upload bandwidth, in order to send 39 video streams encrypted wit

>Wouldn't E2E encryption of a call with 40 participants require each user to have 39 times the upload bandwidth, in order to send 39 video streams encrypted with different keys? I think you use public key cryptography to securely distribute an encryption key for that call. So the host sends 39 messages encrypted with different keys containing a shared key. Then everyone uses the shared key to encrypt/decrypt the call data.