woody_82 wrote:
Re malware presumably all i'd need to have done though is inadvertently click on a dodgy link or download?
Not quite. Clicking a link is not sufficient to infect you at this time. You would have to first download something from a dodgy site, then open the downloaded file. However, for all known malware, that would still fail - Mac OS X would prevent the malicious file from opening. It is not outside the realms of possibility that you have been infected by something that is brand new and never before seen by the security community. However, this is pretty unlikely. The last new Mac malware that appeared did so back in February.
I was just wondering too whether access to my Wifi network (at home) could lead to someone obtaining card details when I entered them into a retailers site??
This is also unlikely. An insecure wifi network can be dangerous, but any site dealing with credit card details will use encryption to protect the data. That would prevent a snoop on the same network from being able to intercept a credit card number directly. Of course, that might make it possible for someone to intercept other data, which could give them access to some of your online accounts. That could indirectly expose your cards... for example, if someone managed to hack your Apple ID, they could use it to make purchases without actually having access to the credit card on your Apple ID account.
Note that the only way an insecure network is a danger is if someone malicious is within range and can connect to that network. If you live in a rural area, or even a suburban area where the houses aren't too close, you probably don't have anyone within signal range, so a hacker on your wifi network would be an almost impossible scenario.