Contactless VISA cards

[Richard Jones]

My bank in their infinite wisdom decided to expire my old VISA card
early and issue me with a new "contactless" one.

It has a logo similar to this (but smaller):

http://images.pcworld.com/news/graphics/129377-2505p026-2b.jpg

I'm dubious about important documents like this which can be read
remotely.  Are their known risks?  How far away can they be read (in
reality)?  Is the crypto on these serious and independently assessed?
Should I buy a tinfoil wallet / hat / coat?

Rich.

-- 
Richard Jones
Red Hat