....com... On Jul 26, 5:37 pm, thagor2...@googlemail.com wrote: On 25 Jul, 21:43, Chris <chrisjba...@btinternet.com> wrote: Of course they can - incorrect data downloaded to cards can easily makethem inoperable. I've not yet come across r/w memory that can't be reset if theres dodgy data on it so unless they're upgrading any software there may be on it I can't ...

... Chris <chrisjba...@btinternet.com> wrote: Of course they can - incorrect data downloaded to cards can easily makethem inoperable. I've not yet come across r/w memory that can't be reset if...a software update to your readers that drops a byte from the command being sent to the chip - most cards will just fail to work, but a few will get that magic 0110 bit pattern at the ...

... they can - incorrect data downloaded to cards can easily makethem inoperable. I've not...I can easily believe that the mifare card could have a setting to flag ... be incremented, never decremented. Initially the card is created with this address as 0... the address incremented to 1. A card can be totally disabled by incrementing ... in such a way that the card looks like it has a different ...

On 25 Jul, 21:43, Chris <chrisjba...@btinternet.com> wrote: Of course they can - incorrect data downloaded to cards can easily makethem inoperable. I've not yet come across r/w memory that can't be reset if theres dodgy data on it so unless they're upgrading any software there may be on it I can't see how it could happen. And if thats the case you have to ask yourself why. Both ...

...: While everyone is enjoying the card hacking speculation I don't think this...>> I'd be interested in hearing then why suddenly oyster goes down twice in 2 weeks , the 1st time...> Of course they can - incorrect data downloaded to cards can easily makethem inoperable. Only if you design your systems wrongly. Incorrect data in the validators could easily make ...

... and I didn't see crowds of people with travelcards on Oyster waiting to be let through.  I am on paper at the moment, so I didn't test it with an Oyster Travelcard. The problem was only affecting PAYG, which isn't available at Cannon...NR barrier at a station that never accepts PAYG won't corrupt your Oyster if there is a valid travelcard on it. But we don't ...

...: While everyone is enjoying the card hacking speculation I don't think this...>> I'd be interested in hearing then why suddenly oyster goes down twice in 2 weeks , the 1st time...> Of course they can - incorrect data downloaded to cards can easily makethem inoperable. Only if you design your systems wrongly. Incorrect data in the validators could easily make ...

... and I didn't see crowds of people with travelcards on Oyster waiting to be let through.  I am on paper at the moment, so I didn't test it with an Oyster Travelcard. The problem was only affecting PAYG, which isn't available at Cannon... NR barrier at a station that never accepts PAYG won't corrupt your Oyster if there is a valid travelcard on it. But we don't really...

... While everyone is enjoying the card hacking speculation I don't think ... be interested in hearing then why suddenly oyster goes down twice in 2 weeks , the 1st time trashing 60K cards, if it was just some "data...course they can - incorrect data downloaded to cards can easily makethem inoperable. Only if you design your systems wrongly. Incorrect data in the validators could...

...> wrote: While everyone is enjoying the card hacking speculation I don't think this problem ...> I'd be interested in hearing then why suddenly oyster goes down twice in 2 weeks , the 1st time trashing 60K cards, if it was just some "data upload error" ...> B2003 Of course they can - incorrect data downloaded to cards can easily makethem inoperable. Both today anda couple of weeks...