alt Hacker News"Trust about whether or not another company will maintain confidentiality" still sounds like a business problem to me (or at least one valid way of perceiving the problem)
And the biggest advantage I see of this perspective over the "technical problem" perspective is that assigning responsibility completely covers the problem space, while "hope that some clever math formula can magic the problem away" does not.
Here at HN, I think most people see it differently (me included): having clear math proof of "confidentiality" is usually seen as both cheaper and more trustworthy.
Yes, there might be a breakthrough or a bug in encryption, and jnless you've been targetted, you can respond. But we've seen and experienced breakdowns in human character (employees spying on customers, stealing data...), government policies and company behaviour to trust the complexity and cost (lawyers) of enforcing accountability through policy.
In general, you do need both, but if you've got one, to engineers, technical solution is usually more appealing.