[Cryptography] RFID Protocols

[Bill Stewart]

On 10/2/2015 2:36 PM, Ryan Carboni wrote:
> A google search yields nothing for RFID protocols. So I'm going here to
> ask the following questions:
> Can an RFID chip contain a store of entropy	

     Once :-)

 > (meaning must a lightweight
> cipher be secure against known and chosen key attacks)?
> How does an RFID protocol prevent replay attacks?

     Most RFIDs are just simple ROMs with one number.
There are fancier versions, if you want a smart-card
sort of thing that can do calculations,
but that needs power or at least a bigger antenna.