Signal also checked with US government sources about the alleged flaw, which cropped up over the weekend, but says those 'we spoke to have no info suggesting this is a valid claim.'
Many phones with Google Messenging apps reply to SMS with RCS by default, which Signal can’t support because it’s proprietary.
So Signal users didn’t receive replies to SMS they sent.
Using Signal for SMS also gave users a false sense of security, thinking SMS sent from the app would be encrypted, despite an in-app warning.
Finally, users kept blaming Signal for bugs in their provider’s faulty SMS implementation and gave the app bad reviews for something the devs have no control over.
Many phones with Google Messenging apps reply to SMS with RCS by default, which Signal can’t support because it’s proprietary.
So Signal users didn’t receive replies to SMS they sent.
Using Signal for SMS also gave users a false sense of security, thinking SMS sent from the app would be encrypted, despite an in-app warning.
Finally, users kept blaming Signal for bugs in their provider’s faulty SMS implementation and gave the app bad reviews for something the devs have no control over.
As far as I know, the protocol itself is open, but there’s no open-source reference implementation. Is this what you mean by “proprietary”?
https://www.gsma.com/futurenetworks/wp-content/uploads/2019/09/RCC.07-v10.0.pdf