The IAB has published RFC 7624: Confidentiality in the Face of Pervasive Surveillance: A Threat Model and Problem Statement.

Abstract: Since the initial revelations of pervasive surveillance in 2013, several classes of attacks on Internet communications have been discovered. In this document, we develop a threat model that describes these attacks on Internet confidentiality. We assume an attacker that is interested in undetected, indiscriminate eavesdropping. The threat model is based on published, verified attacks.