The FBI encourages us all to try our hand at cryptanalysis. Their cipher is as follows:
VFWTDLCSWV. YD NSLMIJFWEJFD GSW SL NIJNQBLM FOBV EJFDVF DLNIGTFBSL. KBVBF YYY.AHB.MSK/NSCDC.OFZ FS EDF WV QLSY SA GSWI VWNNDVV.
The first thing that stands out is the website, YYY.AHB.MSK/etc. Because of the formatting, we can assume it's a simple substitution cipher, and see what happens (we're not wrong). What website might this be? WWW.FBI.GOV, perchance? I think yes. The sentence with the URL begins with KBVBF, which is probably a verb in reference to the URL. What can we do to URLs? Go to them? Not five letters. Visit them? I think yes, given: visit, kbvbf. Keep doing this for a few more minutes (or, be smart/lazy and write a quick decoder), and you'll get the finished product:
"Stupendous. We congratulate you on cracking this latest encryption. visit www.fbi.gov/cod