Whether or not you have been hacked depends on your definition of “hacked.” In the broadest sense, it means that some of your sensitive information has been compromised … that a hacker or identity thief has gained access to some of your data or network resources such as camera or printer. If this is your definition of “hacked” I imagine nearly everyone reading this article has been hacked.
In just a single incidence of mega-hacking, hackers gained root level access to over 19 servers at JP Morgan Chase, compromising the information of approximately 76-83 million households and 7 million businesses for weeks! As of 2009, only about 110 million US households had bank accounts, so about ¾ of US households were affected.
Chase is not some hayseed bank. Chase underpins the global banking infrastructure. Worse than the fact that some of your information was almost certainly comprised in the Chase hack or in one of any number of large hacks and is now in the hands of black hat hackers, is that that the hacker or group of hackers had plenty of time to learn everything they wanted to know about the banking industry’s IT security practices.
An increase of fraud activity has not been detected yet, but we do know that the hacker(s) carefully examined all of the network security software, so they will be very well prepared for future attacks and will be much harder to detect. Regardless of whether or not you consider an event like this to be “you being hacked” or not, it still affects you and your OPSEC (operational security).