The US National Academies has recently published a study report titled "Cryptography and the Intelligence Community: The Future of Encryption" that focuses on the balance between encryption and decryption in the coming 10-20 years; it uses a scenario driven approach to analyze the landscape. The report, plus a highlights document, can be found here, along with some background on the project:

Future of Encryption

The National Academies of Sciences, Engineering, and Medicine, will convene an ad hoc committee to identify potential scenarios over the next 10 to 20 years for the balance between encryption and decryption (and other data and communications protection and exploitation capabilities). A peer-reviewed consensus report is expected to be published Fall 2021.

This work included consideration of the implications of quantum computing developments, but was scoped much more broadly.

There was a launch webinar for the report on September 13 (which I attended) that provided an excellent summary. This was recorded, and I expect that it should be available on the National Academies channel on Youtube in the near future.

Clifford Lynch Director, CNI