[teraflop]

The base64-encoded SSL certificate for *.ycombinator.com is 1,755 characters. Maybe there are a few savants in the world who are capable of memorizing that, but for the overwhelming majority of human beings, it's never going to happen.

[growse]

Point is, it's information. It's very easily copied. The whole point of 'something you have' is that it's not just data, but something more than that.