[everfrustrated]

Isn't this somewhat equilivent to ensuring cookies are required?

Obviously this technology is different but the same sort of result.

What's the end game here? All humans end up having to use a unique encryption key to prove their humanness also?

[pmontra]

I understand your concern and we are probably headed into that direction, but that does not prove humanness any more than the subject of this post proves botness. They prove the knowledge of the value of a key.