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Essentially, the apps which don't use Google FCM service are not affected (from what I understand?). I assume that there isn't a problem on the client-side and this exploit works purely because Google stores these notifications.
Would you happen to know what WhatsApp and Signal use? I believe FOSS apps from F-droid do not use Google's notification service
Thanks, I'll go read some more. I'm trying to move away from WhatsApp and wanted to run Signal in my main profile on Graphene. I hope I can use it without FCM there.
Signal does have a fallback if FCM is unavailable. It supposedly uses slightly more battery, but I can't say I noticed it. I've swapped to using Molly which is a fork of Signal which implements UnifiedPush (among some other features).
Thanks
Anything using FCM will be effected. UnifiedPush which I mentioned I don't believe has an option to encrypt notification content either. Using it you'd already at least have the option of using a provider with a better privacy policy or self hosting it.
This is not an option you would actually want from any service.
You don't want to be giving the plain text message to anyone to encrypt. Instead the notification contents should be given to the service provider (FCM or anyone else) already encrypted and only able to be decrypted by the app.