[11594] in cryptography@c2.net mail archive
Re: Smartcard in CD
daemon@ATHENA.MIT.EDU (R. Hirschfeld)
Sat Aug 31 14:42:24 2002
Date: Sat, 31 Aug 2002 12:57:01 +0200
From: "R. Hirschfeld" <ray@unipay.nl>
To: ptrei@rsasecurity.com
Cc: HugheJP@LOUISVILLE.STORTEK.COM, Michael_Heyman@NAI.com,
cryptography@wasabisystems.com
In-reply-to:
<F504A8CEE925D411AF4A00508B8BE90A041BADCA@exna07.securitydynamics.com>
(ptrei@rsasecurity.com)
Reply-To: ray@unipay.nl
> From: "Trei, Peter" <ptrei@rsasecurity.com>
> Date: Wed, 28 Aug 2002 11:24:15 -0400
> I wonder about induction too - could you put a small magnet in
> the disk, and use the varying induced fields in the reader
> mechanism to generate power?
Contactless smart cards typically have coils in the card and the
magnetic field is generated by the reader.
Capacitive coupling is an alternative but requires more precise
alignment and thus doesn't really provide a proximity/vicinity card
like inductive coupling does.
On-board batteries are hard to fit on an ISO-format smart card but
maybe with the new ultra-thin batteries that's no longer the case.
Batteries are perhaps more suitable for a CD.
---------------------------------------------------------------------
The Cryptography Mailing List
Unsubscribe by sending "unsubscribe cryptography" to majordomo@wasabisystems.com
