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What of your digital communication should law enforcement be able to find?
Privacy is a rapidly changing concept. In many respects, it has faded markedly over recent decades. Transparency seems an almost overwhelming zeitgeist. Secrets have become very hard to keep, despite vigorous attempts. See, e.g., http://www.homelandsecuritynewswire.com/dr20151208-untraceable-communication-guaranteed . This new work, in itself, is not a paradigm shift as much as it is a modernizing of a model long in use — e.g., two users sharing a username and password who leave messages in “draft” form on an email server which, itself, was a technologized update of the “dead drop” methodology spies have used as long as there have been spies.
Hope springs eternal, e.g., https://gcn.com/articles/2015/12/08/private-data-as-a-service.aspx . However, for the nonce, privacy and transparency remain locked in a continuing battle, much like bazookas (and their successors) versus armor. When the power of attackers increases the defenders develop stronger protections. Thus it has been, both in physical and digital worlds, for a long time.
What changes that dynamic usually is a paradigm shift, often from outside the attacker/defender box. The paradigm shift may reflect changes in technology and/or changes in mindset but, either way, the old attacker/defender paradigm becomes either less useful or irrelevant.
What possible paradigm shifts do we see? For example,
1. could the general public become more comfortable with increasing transparency, including to police and other intelligence agencies?
2. could invasive technologies stably overcome any probable defenses?
3. could an electromagnetic pulse (or a conceptual equivalent) stably make this game irrelevant?