Earlier quoted context omitted.
Signal uses asymmetrical encryption - your private key is very well able to prove your identity - I'm pretty sure the concept "identity" in Signal is built on that technology. But for contacting people - well - what else would you suggest?!
Hi plusquamperfekt. I don't know your mail address or telephone number. If this message manages to reach you - can you explain your point a bit more? If the private key would _be_ the identify, that'd be awesome. And maybe I fail to understand ChatSecure/Signal. I'd be glad to be corrected. But as far as I understand, that system ties a user to a mobile number, because 'that is as good a unique identifier as we get'…
F.x. I installed a while ago Signal on my phone and recently went to another country where I used a different SIM card (hence a different phone number) and I could still use my Signal app as usual.