Discussion was about cipher block modes in the context of Nostr and NIP-04. You might notice all 3 levels above your comment reference either the Nostr protocol in general, or NIP-04 messages.
> And GCM does not ‘add’ a signature per se.
Your own comment to which I replied said "It’s not tamper proof, ie signed, unlike GCM". Wouldn't most people consider something "signed" as having a signature?
It’s not tamper proof, ie signed, unlike GCM
> Some modern modes of operation combine confidentiality and authenticity in an efficient way, and are known as authenticated encryption modes
https://en.m.wikipedia.org/wiki/Block_cipher_mode_of_operati...
I’d also add: CBC requires padding and GCM does not. Minor convenience.