Wednesday, December 31, 2008

FBI "Cryptanalysis"

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.

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Spoiler alert:

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/coded.htm to let us know of your success." Where, presumably, they log your IP. Thanks, FBI. You make us feel important.

Cheers.

Sunday, December 28, 2008

Something we can agree on...

Monday, December 15, 2008


What would John McCarthy say if he saw you programming?