DARPA want to build a secure messaging app ..
The messaging platform will transfer messages via a secure decentralized protocol that will be secured across multiple channels, including but not limited to:
1) Transport protocol,
2) Encryption of messages via various application protocols,
3) Customized blockchain implementation of message deconstruction and reconstruction, and decentralized ledger implementation.
https://thehackernews.com/2016/04/secure-messenger.html clearnet sites
TOR was developed in the mid-1990s by United States Naval Research Laboratory employees, mathematician Paul Syverson and computer scientists Michael G. Reed and David Goldschlag, with the purpose of protecting U.S. intelligence communications online.