> And they don't as far as we can tell. That's wishful thinking which you have no evidence for. But let's assume that you're correct - eventually they will hav

> And they don't as far as we can tell. That's wishful thinking which you have no evidence for. But let's assume that you're correct - eventually they will have a way to analyse it en masse. There are, then, two things we need to bear in mind: - is the time horizon likely to be close enough that data currently collected will be relevant then - if we allow the collection now, will it be easy to roll back that collection later when the threat is on the horizon The answer to both of those questions is yes. Similarly, we use high strength encryption now, even if we think 128-bit is fine, because in time it won't be. The above is theoretical. The next bit isn't - they will _always_ be able to decide that agent A should look at video B from N years ago. They can't do that for a letter on the hypothetical table, or a message stored with strong encryption that stands the test of time - it won't exist in N years.