[joecool1029]

FWIW textsecure (signal's SMS predecessor) did provide forward secrecy. Details are here: https://signal.org/blog/asynchronous-security/

[maqp]

Yeah but it later also supported non-E2EE SMSs and those were a security risk and they rightfully dropped the support. It was not ideal your grandma thinks any message sent in Signal is safe, when that wasn't the case.