Yes. Why not? You just have to encrypt the message before sending it and decrypt it after you received it. https://github.com/google/end-to-end https://github.

Yes. Why not? You just have to encrypt the message before sending it and decrypt it after you received it. https://github.com/google/end-to-end https://github.com/google/end-to-end I think the actual challenge is to do it with senders/receivers you do not know. I do not have enough secuirty experience to be able to answer how you can encrypt something on one end but decrypt it on the other hand without knowing the key? I guess something like HTTPS would work.