> AFAIK all Symbol WLAN equipment support WEP and almost all of their
> equipment supports their kerberos authentication capability.

I don't think kerberos would help protect the SQL payload.

> So why roll out a insecure implementation in the first place? If the
> device has no security capabilities, why use it?

Security is only one in a list of priorities. Another might be 
interoperability with existing equipment. If a secure solution would 
require replacing tens of thousands of dollars of equipment and a major 
upheaval, I imagine there are companies would take the risk.

> There are many other retailers with the exact same problem

It's long past time for the use of credit card numbers in retailers to be 
phased out... All card-present authentication could have been done with a 
secure challenge-response mechanism using smartcards for a couple of years 
now. Card readers are so much cheaper than magnetic stripe readers that 
even retailers still using carbon-paper authentications could have moved 
over by now without prohibitive expense. There's no reason for any data 
handed over in a transaction to be able to validate another transaction.

If the credit card issuers are only *just* getting to grips with this kind 
of secure technology, I don't think it's particularly damning that a 
retailer has problems with transmitting data insecurely. At this point in 
time, it's probably more likely for an employee to skim the cards and 
produce a duplicate than for someone to capture them off-air.

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