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are there any other RCS apps than Google Messages ?

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    [deleted] No, Google hasn't opened up RCS yet.

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    Solved

    RCS is fundamentally a g* product, as it routes all your messages through g* servers. I don't recommend its use on that basis.

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      Real question: is Messages truly E2EE like Signal? Or just branded as E2EE like WhatsApp?

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        [deleted] If you use RCS then your messages are E2EE.

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        csis01

        How is this worse than SMS, which is unencrypted?

          [deleted] 1) You can't trust encryption if you can't read the algos.
          2) Even if you could trust the encryption, its now going through MORE HANDS. Not only does your service provider know about messages you're sending, g* also does. g* does NOT know if you send an SMS.

          That means that g*, even if you assume that the encryption is good, knows that (a) you sent or received a message, (b) at what time, (c) from/to whom, (d) physical location of both parties. That's not data you should be sharing with a hostile adversary!

            On a slight aside, I would invite people to watch the documentary The Good American https://www.imdb.com/title/tt4065414/

            It speaks of how back in 2001 the NSA could intercept any electronic form of communication, and even if encrypted could pull on it's metadata to learn a lot about the sender, receiver and even predict what was being talked about.

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            csis01

            I don't care about open source. It's a kind of myth that's often found.

            In the real world: 99% of people don't know read code, and about the remaining 1%, most will have no expertise in security, and even less in cryptography.
            I prefer the opinion of a company specializing in audits, with experienced cryptographic experts, rather than people who often have as much knowledge as I do, i.e. very few.

            I'd rather have google and my carrier know that I'm sending a message, without having the content, than have only my carrier see it, but also be able to read it.
            I trust google's security more than the poor security of my country's carriers.

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              @csis01 Don't take it personally, but I took a look at your profile, and from your comments, I can see that you're biased against Google, which taints your advice against it.
               
              Giving biased advice and opinions isn't productive or helpful, and I would like you to stop.

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                [deleted] I'd rather have google and my carrier know that I'm sending a message, without having the content, than have only my carrier see it, but also be able to read it.
                I trust google's security more than the poor security of my country's carriers.

                You're completely right. While Google isn't known for being privacy-friendly in any capacity, it's sure as hell known for its security and security practices. Using RCS is miles better than using SMS.

                  [deleted] I don't care about open source. It's a kind of myth that's often found.

                  No, its not a myth. Open source is real. And just because YOU can't read something doesn't mean that NOBODY can. It is far safer to use something open source that somebody trustworthy has read, than anything closed.

                    [deleted] Using RCS is miles better than using SMS.

                    And if you wouldn't mind, who exactly is saying that you should use SMS?
                    RCS and SMS are not the only options available. Tons of other choices.

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                      csis01 Deleted. (Got confused between threads).

                      [deleted] Did I say that you were? You need to read the words that are actually written, and not things that weren't written.

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                        csis01 You said anyone supporting Google. I do, in a way, support Google by recommending Google Messages or something like GBoard.