[toast0]

Afaik, e2e messengers don't include ciphertext with push notifications. It's an empty push to wake the client. Then the client contacts the origin to fetch the ciphertext.

[saagarjha]

This is how it used to work; notifications can be encrypted now and Signal uses an extension to decrypt them.

[pseudalopex]

A Signal developer 12 days ago said Our FCM and APN notifications are empty and just tell the app to wake up, fetch encrypted messages, decrypt them, and then generate the notification ourselves locally.[1]

[1] https://news.ycombinator.com/item?id=47723445

[saagarjha]

Ah, yes, they would be right. I feel like I had read that someone had migrated at some point, maybe it was WhatsApp or something.