There are several commercial charging points - but he doesn't have a security tag to unlock them.

BBC: Leading the charge on electric cars

Ulevitch's hacker paranoia inspired him to add an extra security feature: All DNS servers tag data with one random number (from 1 to 65, 000) to enable servers to recognize the right piece of data at the right time.

FORBES: No Phishing Zone

Two major private security firms face an investigation into whether they were overpaid for contracts to electronically tag criminals.

BBC: Serco and G4S face billing probe over electronic tagging