No
- Robert -
Robert A. Macy, PE [email protected]
408 286 3985 fx 408 297 9121
AJM International Electronics Consultants
619 North First St, San Jose, CA 95112
-----Original Message-----
From: Doug McKean <[email protected]>
To: EMC-PSTC Discussion Group <[email protected]>
List-Post: [email protected]
Date: Thursday, June 13, 2002 11:07 AM
Subject: Side Issue: Proximity Cards in Wallets ...
>
>A proximity card reading security system is used in
>a company, possibly based on the Wiegand Effect.
>Some of the employees put their security cards in
>their wallets to have them all the time. When needing
>access to an area that requires a card, users simply
>pull out their wallets, swipe the wallet in front of the
>reader and thus gain access. For those people with
>cards in their wallets, they do not pull the security card
>out of the wallet and then swipe the reader. They all
>swipe the reader with the wallet.
>
>A question was posed to me that involved the swamping
>of the card with a magnetic field to identify the card. The
>electronics in the card generates a series of pulses from
>the pulsed magnetic field that when received by the card
>reader validate or invalidate the card.
>
>Is this field strong enough to wipe any magnetic strips on
>any credit or bank or any of the other types of cards using
>magnetic strips that may also be in the wallet?
>
>Regards, Doug McKean
>
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