An unusual move by IISS placing a current article in 'Survival' online on this topic, the authors are Daniel Moore and Professor Thomas Rid, both from Kings Wars Studies. It opens with:
Encryption policy is becoming a crucial test of the values of liberal democracy in the twenty-first century. The trigger is a dilemma: the power of ciphers protects citizens when they read, bank and shop online – and the power of ciphers protects foreign spies, terrorists and criminals when they pry, plot and steal. Encryption bears directly on today’s two top threats, militant extremism and computer-network breaches – yet it enables prosperity and privacy. Should the state limit and regulate the fast-growing use of cryptography? If so, how?

There is a seminar tomorrow @ IISS, so that will appear as a podcast shortly after and on their YouTube channel.

I note they have surveyed the use of Tor by the "bad" people.