On 20/05/2013 15:39, Frank Erskine wrote:
On Mon, 20 May 2013 06:38:41 -0700 (PDT), therustyone
wrote:

On Monday, May 20, 2013 2:22:00 PM UTC+1, Lee wrote:
Can always re-purpose the tin foil from the hat to screen the card

You would need a ferrite-based card holder to deny magnetic field access.
Could be a business opportunity.

Mu-metal.

Probably needs to be a sandwich of mu-metal inside copper inside silver
to get maximum screening in minimum thickness.

According to that R4 consumer programme some M&S terminals were
particularly aggressive about using contactless cards at a distance.

It is clear folly to have contactless unvalidated transactions. No-one
needs to be able to buy things whilst wizzing past on a water slide!

--
Regards,
Martin Brown