Skip to Content Skip to Search Go to Top Navigation Go to Side Menu


Archive for December, 2008


I pwned the FBI Cyphertext challenge in about 45 minutes using a pen and paper.


Monday, December 29, 2008

FBI logo

Each year the FBI has an open encryption challenge:

http://www.fbi.gov/page2/dec08/code_122908.html

Here is the encrypted FBI cyphertext:

VFWTDLCSWV. YD NSLMIJFWEJFD GSW SL NIJNQBLM FOBV EJFDVF DLNIGTFBSL. KBVBF YYY.AHB.MSK/NSCDC.OFZ FS EDF WV QLSY SA GSWI VWNNDVV.

The decrypted cleartext reads:


STUPENDOUS. WE CONGRADULATE YOU ON CRACKING THIS **TEST ENCRYPTION. VISIT WWW.FBI.GOV/CODED.HTM TO LET US KNOW OF YOUR SUCCESS.

Am I the first to crack this? Google seems to think so. Will I be the recipient of an FBI home-invasion tomorrow morning (they now have my IP address)?

~UPDATE. I think I’m the second to crack this and post it for all to see. The other guy beat me by about 12 minutes.


Powered by Laughing Squid