Faraday cages (was: Re: Floppies - Actual Question)

From	Nuno Silva <nunojsilva@invalid.invalid>
Newsgroups	comp.os.linux.misc
Subject	Faraday cages (was: Re: Floppies - Actual Question)
Date	2025-10-09 17:02 +0100
Organization	A noiseless patient Spider
Message-ID	<10c8mb0$2vjfu$1@dont-email.me> (permalink)
References	(8 earlier) <95ogrlxsru.ln2@Telcontar.valinor> <af-dncNqL6mEbHj1nZ2dnZfqn_adnZ2d@giganews.com> <umlhrlxmm6.ln2@Telcontar.valinor> <cards-20251008130855@ram.dialup.fu-berlin.de> <10c8jko$2tcv3$2@dont-email.me>

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On 2025-10-09, Rich wrote:

> Stefan Ram <ram@zedat.fu-berlin.de> wrote:
>> "Carlos E.R." <robin_listas@es.invalid> wrote or quoted:
>>>There was no urban legend in those years, floppies were a recent 
>>>invention.  We simply did not know.  We invented the urban legends.
>> 
>>   Some people around here are walking around with those RFID cards 
>>   today, and they're thinking about wrapping them in aluminum foil to 
>>   make it harder to scan them.
>
> Given that RFID is electromagnetic (radio) comms, and very low power, 
> an aluminum foil wrap (creating an ungrounded Faraday cage) just might 
> attenuate the signal enough to prevent a "read" from happening.

Doesn't it need a non-conductive layer too? What is the state of the art
for cheap shielding of contactless smartcards?

-- 
Nuno Silva

(No, enclosing in carbonite is not a feasible option, for reasons.)

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Re: Floppies - Actual Question ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-06 10:29 +0000
  Re: Floppies - Actual Question Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-10-06 22:08 +0000
  Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-06 23:30 -0400
    Re: Floppies - Actual Question Rich <rich@example.invalid> - 2025-10-07 15:16 +0000
      Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-08 02:34 +0200
        Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-08 01:05 -0400
          Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-08 10:58 +0200
            Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-08 11:06 +0100
            Re: Floppies - Actual Question ram@zedat.fu-berlin.de (Stefan Ram) - 2025-10-08 12:10 +0000
              Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-08 14:14 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 02:44 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-09 21:10 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 21:36 -0400
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-10 09:54 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-11 01:57 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-10 13:49 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-11 02:29 -0400
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-11 14:32 +0200
                Re: Floppies - Actual Question Joerg Walther <joerg.walther@magenta.de> - 2025-10-09 12:50 +0200
                Re: Floppies - Actual Question "Carlos E.R." <robin_listas@es.invalid> - 2025-10-09 21:11 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 21:37 -0400
                Re: Floppies - Actual Question Joerg Walther <joerg.walther@magenta.de> - 2025-10-10 11:19 +0200
                Phone wallet "Carlos E.R." <robin_listas@es.invalid> - 2025-10-10 13:51 +0200
                Re: Phone wallet c186282 <c186282@nnada.net> - 2025-10-11 02:30 -0400
                Re: Phone wallet "Carlos E.R." <robin_listas@es.invalid> - 2025-10-11 14:32 +0200
                Re: Phone wallet c186282 <c186282@nnada.net> - 2025-10-11 21:35 -0400
                Re: Phone wallet "Carlos E.R." <robin_listas@es.invalid> - 2025-10-12 14:48 +0200
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 21:17 -0400
                Re: Floppies - Actual Question Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2025-10-10 06:51 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-10 03:29 -0400
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-10 09:55 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-11 02:10 -0400
              Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-08 13:18 +0100
                Re: Floppies - Actual Question Robert Riches <spamtrap42@jacob21819.net> - 2025-10-09 03:09 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 02:58 -0400
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-09 12:45 +0100
                Re: Floppies - Actual Question Robert Riches <spamtrap42@jacob21819.net> - 2025-10-10 02:53 +0000
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 23:44 -0400
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 02:45 -0400
              Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-09 02:38 -0400
              Re: Floppies - Actual Question Rich <rich@example.invalid> - 2025-10-09 15:16 +0000
                Faraday cages (was: Re: Floppies - Actual Question) Nuno Silva <nunojsilva@invalid.invalid> - 2025-10-09 17:02 +0100
                Re: Faraday cages Rich <rich@example.invalid> - 2025-10-09 18:48 +0000
                Re: Faraday cages The Natural Philosopher <tnp@invalid.invalid> - 2025-10-10 09:49 +0100
                Re: Floppies - Actual Question The Natural Philosopher <tnp@invalid.invalid> - 2025-10-10 09:47 +0100
                Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-11 01:05 -0400
        Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-08 01:52 -0400
      Re: Floppies - Actual Question c186282 <c186282@nnada.net> - 2025-10-08 01:38 -0400

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