Annie sighed. "Settle down, boys. All right. Something you know and something you have. Two factors. Okay? But we need more than that. The dongle itself has a biometric scanner. Most people use fingerprints or retinal scan, even aural topology scan, but there are issues with those. Once they’re compromised, that’s it—you have a finite number. And they lend themselves to rather ugly forms of violence. We’re trialling microbial cloud analysis. The sensor in the dongle is actually patterned after canine nasal cells, which always sounds a little bit weird." Yes. To these silicon children, biology is outré. "Anyway: everyone has a distinct collection of biomass on and around the skin. Recognition is about 96 per cent accurate, so not perfect, but it’s incredibly hard to fake. For full-access login, we have predictive neural modelling and response."