Two days ago, on Thanksgiving, the NSA sent encrypted greetings to “every NSA employee across the globe”. Can you break this encryption?
The NSA is very active on Facebook, sometimes publishing several posts a day. Last Thursday, i.e. on Thanksgiving (contrary to Halloween, this festivity has not gained popularity in my home country yet), the NSA spread the following message via its Facebook account:
Apparently, these greetings contain two encrypted lines. According to a few Facebook comments, the solution isn’t very hard to find. Can a reader solve this challenge?
Readers who (like most Europeans) don’t celebrate Thanksgiving and who (like some Europeans) speak German might be more interested in the advent challenges of the Karlsruher IT-Sicherheitsinitiative. This series of crypto puzzles, titled “Krypto im Advent”, runs from Dezember 1-24. Everybody may participate, but only pupils up to the ninth grade (i.e., up to the age of about 16) can win a prize.
Much to my joy, one of the prizes is a copy of my book Versteckte Botschaften- Die faszinierende Geschichte der Steganografie, which was donated by the Thalia book store in Karlsruhe, Germany. If you happen to live in the Karlsruhe area, please consider this store on your next shopping tour.
Further reading: Revisited: NSA’s unsolved Twitter challenge from 2014