BBC Moneybox - contactless hiccups

Roland Perry lists at
Mon May 20 13:34:51 BST 2013

In article <E1UeMiu-0002DJ-VZ at>, Chris Edwards 
<chris-ukcrypto at> writes
>> What if the contactless credit card is adjacent to an Oyster or ITSO card in
>> your wallet?
>$workplace uses a mifare card based entry system (wave your wallet
>containing card at door reader).  Last year, I started frequently having
>problems opening doors.  Then I realised this was due to my bank having
>issued a new visa card, which has the "pay-by-wave" logo (looks a bit like
>a WiFi symbol).  Removing this visa card from my wallet reinstated by
>ability to open doors.
>I had some idea the protocols specifically catered for multiple cards, and
>that the door card reader would be able to "select" the card it wants to
>talk to.  But if so, this doesn't seem to work very well (for me).

It's never worked for me (in either direction) trying to unscramble an 
Oyster with something else.

I suspect a field trip is in order... (and while I'm at it I can see if 
LRT buses accept my Paywave Paypal debit card or not - from the 
publicity material it's ambiguous).
Roland Perry

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