The result is that if you want to send a secure RCS message between Android devices, you should use the Google messages app at both ends; It implements E2EE using the well -used signal protocol. Similarly, Apple adopted the RCS in Imessage last year, but with an implementation owner of E2EE.
In short, it is a confusing clutter. This is one of the reasons why alternatives such as WhatsApp and Signal, which also use the signal protocol, have become so popular; You go out of the box without worrying about compatibility, and they allow groups up to 1,024 members.
Having a single protocol, MLS, covering E2EE, changes history. Now, RCS with MLS can offer a range of advanced features, including large groups, which are essential to companies that need communication several to several. Currently, if even a group user uses a compatible E2EE RCS application, the security of the entire group cat can be compromised. MLS gives each applicant of applications an IETF standard to target.
