[Cryptography] toll bills, was Encryption opinion

[Jerry Leichter]

On Aug 27, 2014, at 9:13 PM, dan at geer.org wrote:
> So, Jerry, you are saying that EZ-Pass is two factor auth but where
> the two factors are one from column A and one from column B.
> 
> Yes?
Interesting way to look at it.  In some ways it's *three*-factor:  The photograph the driver's face, too.  But in actual use, the normal pathways only use one factor (almost always transponder ID; sometimes plate) - both "something you have", as it happens.
                                                        -- Jerry