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  • RFID tag
  • Object/Userinformation database
  • RFID manufacturer- make an RFID tag.
  • RFID service provider (highway toll)- sell a highway ticket with RFID tag- write ticket info and custumer's payment info to RFID tag-offer automatic payment service-store customer's track and payment info in information service server
  • Network
  • RFID tag
  • User- purchase a highway ticket with RFID tag- use automatic payment service
  • Customer'sprivate service
  • Back-end DBIDi
  • ID1, ID2,...,IDn
  • Get all IDs
  • Compute H(IDi || r) for all IDsand find IDk, where H(IDk || r)=H(ID || r)
  • Tag
  • IDk
  • H(ID||r), r
  • Query
  • Reader
  • Tag
  • h(IDi), NT, hIDi(NT,NR)
  • Request, NR
  • hIDi+1(NT,NR)
  • Reader
  • k       opad
  • Message Digest
  • k       ipad
  • Message Digest
  • hash
  • m
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