Signal is to get people from SMS and iMessage -> Signal. This means that cross platform communication becomes secure in transit. Once Signal and others have r

Signal is to get people from SMS and iMessage -> Signal. This means that cross platform communication becomes secure in transit. Once Signal and others have really wiped out all the insecure messaging people are doing, then we can start with the identity problem with phone numbers. GCM, Contacts, etc are all related to this "phone number as identity" problem. RCS is an unfortunate grab in this space, and we need to move fast before RCS is the default, and we're back to insecure messaging. Email addresses are the best form of "federated identification" but are wildly insecure for communication. Here's to hoping we can get some better ones.