It's a shame there isn't a standard means to associate keypairs with existing phone numbers in a way that doesn't involve establishing new trust. A <your_phone_

It's a shame there isn't a standard means to associate keypairs with existing phone numbers in a way that doesn't involve establishing new trust. A <your_phone_number_here>.yourcarrier.com DNSSEC secured subdomain provided by your existing carrier that can be coupled with BrowserID perhaps. All you need is a cryptographic tie-in, right?