Definitely - that kind of context is critical. Signal, iMessage, etc. are designed to let you securely connect to people you just met and don’t share much with

Definitely - that kind of context is critical. Signal, iMessage, etc. are designed to let you securely connect to people you just met and don’t share much with other than a phone number. The DoD has the opposite problem: they have a list of people they trust enough to have access and blocking anyone not on that list is a major feature. Beyond the fact that both are sending messages, these problems are less alike than they seem at first.