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Method of encryption for RFID>Propeller — Parallax Forums

Method of encryption for RFID>Propeller

T ChapT Chap Posts: 4,198
edited 2006-09-03 06:10 in Propeller 1
If using the Propeller to receive a serial number from an FRID device where there is a minute chance someone could have a sniffing device near the devices: what type of system could be implemented to encrypt and decrypt the signal to avoid unauthorized use?

Comments

  • hammerhead74000hammerhead74000 Posts: 58
    edited 2006-09-03 05:08
    Well, I'm no RFID expert, but my understanding of it is this: with off the shelf tags... none. A RFID tag will return the same ID each time it's read, and do so in cleartext.

    However, if you are making the silicon, then it stands to reason that you could transmit a public key to the tag, and the tag will return an encrypted signal that only you have the decrypt key to...


    Um... why do you need the tag's id to be private?
  • T ChapT Chap Posts: 4,198
    edited 2006-09-03 05:51
    keyless entry system
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2006-09-03 06:01
    It's not an RFID product, per se, but check out Microchip's KEELOQ system:

    www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=77

    -Phil
  • T ChapT Chap Posts: 4,198
    edited 2006-09-03 06:10
    Excellent. Good call Phil, probably will do what I want, too bad it's PIC based. I suppose it could be interfaced to the Propeller after the receiver side does it's thing. I could have that aspect of the project farmed out, and use it as an add-on board as needed.
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