I was talking to someone only last week about this plus leveraging GPU chips.

The United States Defense Advanced Research Projects Agency (DARPA) is advertising for a business to assist it in building a secure messaging app using distributed ledger (Blockchain) technology for the Department of Defense (DoD).

An advertisement for the role appeared on the Defense Business portal and states that there is a “critical DoD need to develop a secure messaging and transaction platform accessible via web browser or standalone native application.”

The said platform would be required to offer separate message creation, from the transfer of the message within a secure courier to the reception and decryption of the message.