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Last year, we challenged you to crack a code created by the “cryptanalysts” in our FBI Laboratory, who are experts in breaking ciphers of all kinds. 

Tens of thousands of you did so. 

Are you ready for round two? We hope so. But bear in mind, this year's code is slightly more difficult.

Once again:  if you want a primer on basic cipher systems and how to break them, see the article "Analysis of Criminal Codes and Ciphers." 

And if you’re a youngster, we suggest you start with the code on our Kids' page.

To learn more about code-breaking in the FBI: 

• A 400-Year History of Cryptanalysis
• The Zodiac Killer Case 
• The FBI Lab Annual Report

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