Re: It's simple
They don't have to re-write the laws of maths. Merely declare their use in a manner that defeats the (now lawful) intercept methods illegal.
Right. Two things -- (1) if they do that, they're banning internet commerce and online banking, so I can't really see it happening, can you? and (2) if they ever DO try to do it, that's when I'll start giving a toss. Right now, they're not.
Right now it's just commercial providers of end-to-end encrypted services (Skype, Whatsapp, Facetime, Dropbox, Tresorit etc) that fall within the scope of the bill.
As far as I know, the jurisdiction of UK law doesn't extend the California.
Next, they will go after any software that generates uncrackable traffic - OpenVPN, IPSec, HTTPs.
Which, obviously, they will never ever do, because that would be impossible as well as utterly insane. How do you propose they'd order the OpenVPN or OpenSSL or OpenSSH developers to add backdoors for the UK government?