strange hidden files

You may have enabled including invisibles in the Finder. Try this:

Enable Finder to Show Invisible Files and Folders

Open the Terminal application in your Utilities folder. At the prompt enter or paste the following command line then press RETURN.

defaults write com.apple.finder AppleShowAllFiles TRUE

killall Finder

To turn off the display of invisible files and folders enter or paste the following command line and press RETURN.

defaults write com.apple.finder AppleShowAllFiles FALSE

killall Finder

Alternatively you can use one of the numerous third-party utilities such as TinkerTool or ShowHideInvisibleFiles - MacUpdate.

The date are when the items were created at Apple, and the file transfer software preserved the timestamps.

I just did a real quick peak at just one of those hidden folders on my system, and I've got some dates back to 2004. All that means is that there has been no need to modify that specific file since 2004, so it has the date from that time frame.

2014 is noise, as that was at least the year Yosemite was released, so there are going to be a lot of files with 2014 dates in Yosemite.

Those are Mac OS X components and should be left as is.

(123520)

Those 3 files you see inside /usr/share/cracklib are part of a dictionary used to check against when you create a weak password.

If you do a Google search for cracklib you'll find many pages, mainly related to Linux, about the subject.

This link, Using CrackLib to require stronger passwords, is explanatory.