Just a quickie fix here.
If you are experiencing the above error whilst trying to do a fresh install of OS X Mavericks (from a USB stick) there is a good chance all you need to do is change the date that your machine believes it to be.
So for example it is now 17.15 hrs on 15th March 2014.
To fix this error go to the ‘Utilities’ Menu and run ‘Terminal’ (from within the Mavericks’ installer).
Once in terminal enter the date as follows (of course making it the correct current date and time, this simply illustrates the format)…
Now close ‘Terminal’ and attempt the fresh install.
Things should now go your way!