The NSA and GCHQ have jointly published a history of World War II SIGINT: “Secret Messengers: Disseminating SIGINT in the Second World War.” This is the story of the British SLUs (Special Liaison Units) and the American SSOs (Special Security Officers).

Long article on the difficulty (impossibility?) of human spying in the age of ubiquitous digital surveillance.

Former CISA Director Jen Easterly writes about a new international intelligence sharing co-op: > Historically, China, Russia, Iran & North Korea have cooperated to some extent > on military and intelligence matters, but differences in language, culture, > politics & technological sophistication have hindered deeper collaboration, > including in cyber. Shifting geopolitical dynamics, however, could drive these > states toward a more formalized intell-sharing partnership. Such a “Four Eyes” > alliance would be motivated by common adversaries and strategic interests, > including an enhanced capacity to resist economic sanctions and support proxy > conflicts...