The United States is planning to build a encrypted messenger which should be practically unhackable. DARPA which is going to work on this idea, has published an online request, which invites candidates to create a secure messaging and transaction platform, which should be accessible via a web browser or standalone native application.
You can find the DARPA request here:
DARPA explains that the objective of the Secure Messaging Platform is to provide a chat messenger service which is bulletproof and unhackable:
Create a secure messaging and transaction platform that separates the message creation, from the transfer (transport) and reception of the message using a decentralized messaging backbone to allow anyone anywhere the ability to send a secure message or conduct other transactions across multiple channels traceable in a decentralized ledger.
Darpa warns that the US military’s current messaging services are unfit for the present day, with communications vulnerable to interception:
Legacy messaging and back office infrastructures…are expensive, inefficient, brittle and subject to cyber attack. The overhead costs of maintaining such architectures is rising rapidly