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A comment on Apple announces that RCS support is coming to iPhone next year. Parent comment

Re:Apple announces that RCS support is coming to iPhone next... by nicce on Thursday November 16, 2023 @08:56PM (#38298311)
>Also, end-to-end encryption is not part of the RCS specification, but is a proprietary extension to RCS that Google has made exclusive to Messages by Google.[1] This feature should be made open and added to the actual RCS specification so that Apple and other vendors can make use of it.

I thought it is based on Signal protocol? Maybe some commercial wrapper around it.

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Re:Apple announces that RCS support is coming to iPhone next... by acdha on Thursday November 16, 2023 @10:11PM (#38298993)
It’s based on Signal but the key management is completely proprietary. If you read their white paper it directly says that both parties have to be using Google Messages to use E2EE RCS.
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